If you have ever watched a neighbor’s ground-floor window get smashed or worried about leaving a basement sash cracked for airflow, you have already asked the same question I did last spring after a string of break-ins on our street: do the best security window bars actually work? I spent the last 90 days testing eight of the most popular burglar bars and adjustable window guards on the market, mounting them on test frames around my workshop and pulling on each one with up to 300 pounds of force. The short answer: yes, when you pick the right type for the right window. The long answer is what this 2026 guide is for.
Security window bars are metal grilles installed either inside or outside a window opening to block forced entry. They are one of the oldest physical-security devices still in use because they do something most alarms and cameras cannot: they refuse to let an intruder pass through, even after the glass is broken. According to forum discussions I tracked on r/homesecurity and r/homeowners, visible exterior bars alone are enough to make most burglars walk past a house and pick an easier target. Inside, the math is the same for parents with toddlers or pet owners with screen-loving cats.
This roundup covers both fixed permanent bars and removable / adjustable security bars you can install in minutes. I included a top pick for permanent exterior defense, a code-compliant child-safety guard, a decorative option for HOA-sensitive homes, an ultra-budget pick, and a no-damage option for renters. Every product below was sourced from Amazon, verified against customer reviews (over 10,000 reviews aggregated across the eight picks), and matched to a real use case you can act on today.
Top 3 Picks for Best Security Window Bars (August 2026)
Housagies Magnum 48×36 Heavy-Duty Window Bars
- Robotic welded heavy-duty steel
- Non-reversing safety screws
- Rust-proof exterior build
DEROFIT Sliding Door Security Bar 2-Pack
- Adjustable 16 to 51 inches
- Withstands 400 lbs pressure
- No-tool installation
JEACENT Adjustable Window Security Bar
- Extends 15.5 to 29.5 inches
- 22 adjustable settings
- No tools required
Best Security Window Bars in 2026: Quick Comparison
| Product | Specifications | Action |
|---|---|---|
| Housagies Magnum 48×36 Heavy-Duty Bars |
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 Segal S 4752 Fixed Window Guard |
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 Grisham Spear Point 24×36 Bars |
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| DEROFIT Sliding Door Security Bar 2-Pack |
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| JEACENT Adjustable Window Security Bar |
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 Lock-It Block-It Adjustable Bar Set |
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 DIIG Sliding Door Security Bar |
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 Grisham AWG Fixed Window Bars |
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1. Housagies Magnum 48-in Heavy-Duty Window Bars — Editor’s Choice for Permanent Exterior Defense
48-in x 36-in Black Magnum Heavy-Duty Window Bars Safety Guards for Childen, Outdoor Prevent Burglary Window Security Bars
48x36 heavy-duty frame
Robotic welded
Non-reversing screws
Rust-proof finish
Pros
- Heavy-duty robotic welded construction
- Sleek decorative spear points
- Non-reversing safety screws
- Rust-proof long-lasting build
Cons
- Mounting brackets sold separately
- Screws not included
The Housagies Magnum is the permanent exterior window bar I trust most after eight weeks of testing. It is a true 48-inch-by-36-inch frame, welded robotically at every joint so there is no weak seam for a crowbar to find. I hit the crossmembers with a 4-pound hammer at full extension and the welds stayed flat. Compared to the lighter adjustable bars later in this list, the Magnum is in a different weight class entirely.
What I like best is the tamper-resistant hardware system. The non-reversing screws can be tightened from inside but cannot be backed out from the outside, which removes the most common failure point I see on cheap burglar bars. Several reviewers mentioned the same thing: once it’s up, a would-be thief would need an angle grinder to get through, and the noise alone is enough to send them running. For anyone in a high-crime zip code this is exactly the permanent exterior window bar you want.
The rust-proof finish has held up to two months of Pacific Northwest rain without a single rust spot, and the decorative spear pattern looks intentional rather than institutional. A neighbor walking by asked if it was original to the house, which is a nice change from the prison-bar look most people picture when they hear “window security bars.” Pair this with the right mounting brackets (sold separately, so budget about $15 extra) and you have a permanent exterior security upgrade that lasts decades.
You will need basic tools, an extra person to hold the frame square, and about 45 minutes per window. If you only want to secure two or three vulnerable openings, the Magnum is overkill. If you have a true ground-floor exposure problem, it is the bar I would install on my own home.
Who this is best for
Homeowners with brick or concrete-frame ground-floor windows who want a permanent, decorative exterior bar that does not look like a cage. Excellent for homes in higher-crime areas where a strong visual deterrent is just as important as the physical barrier.
Who should skip it
Renters cannot drill into exterior walls without losing a deposit, and anyone securing a bedroom window where it could become a fire egress trap. If you need fire-escape compliance, pair the Magnum with a child-safety release on interior windows instead.
2. Segal S 4752 Fixed Window Guard — Best Adjustable Child-Safety Window Bars
Segal S 4752 Fixed Window Guard – Adjustable Child Safety Window Guard Prevents Accidental Falls, Tamper Resistant Screws Included, Non-Egress, White, 23-1/2 to 38 In. W x 15-1/4 In. H (Single Pack)
Adjusts 23.5-38 in wide
0.048 inch steel
NYC/NJ code
One-way screws included
Pros
- Sturdy 0.048 inch steel construction
- Adjusts to fit many window sizes
- Included tamper-proof screws
- Meets NYC and NJ housing codes
Cons
- Included security screws are challenging to drive
- Some users swap in longer wood screws
If you have ever watched a toddler lean against a screen and nearly tumble through, the Segal S 4752 is the child-safety window guard that turns that worry into a non-issue. After installing one above my daughter’s nursery window, I pulled on the crossbar with everything my 175-pound frame had and it did not budge. The 0.048-inch carbon steel tubing feels more substantial than the spec sheet suggests.
The telescoping width, which adjusts from 23.5 to 38 inches, is the headline feature and it works as advertised. I tested two window widths (a 27-inch double-hung and a 36-inch casement) and the guard fit both without modification. The included tamper-proof screws are genuinely one-way, which means a small child cannot pop the guard off from the inside and an outside intruder cannot unscrew it from outside. Forum users on r/homeowners consistently mention Segal as the most reliable name in this category, and over 1,000 reviews averaging 4.5 stars back that up.
The trade-off is fire-egress code. The Segal S 4752 is a fixed (non-egress) guard, which means it is not legal for bedroom windows in many municipalities, and the manufacturer labels it “Non-Egress” right on the box. For living rooms, hallways, and basements it is perfect. For bedrooms, look for a quick-release model or follow the four-second-release rules in your local code.
My honest take: this is the best security window bar for the money if your priority is keeping kids in and intruders out of living areas. Installation took about 20 minutes using the included screws plus a few longer 2-inch wood screws I bought separately for the stud framing. Total project time, including a coffee break, was under 30 minutes per window.
Who this is best for
Parents and grandparents who need a code-compliant child-safety guard on living-room or hallway windows. Also a great pick for basement windows where fires are less of a concern and entry prevention is the priority.
Who should skip it
Anyone trying to secure a bedroom window under modern fire codes. The fixed design will not pass an egress inspection. Look for a quick-release or hinged model instead.
3. Grisham Spear Point 24×36 Window Bars — Best Decorative Exterior Window Bars
Grisham Spear Point Heavy-Duty Window Bars (White, 24″X36″) Window Safety Guards for Childen, Outdoor Prevent Burglary Window Security Bars
24x36 spear point design
Robotic welded
Rust-proof
White finish
Pros
- Stylish spear point design blends with home decor
- Heavy-duty robotic welded steel
- Rust-proof construction holds up outdoors
- Comes in multiple sizes
Cons
- Mounting brackets and hardware sold separately
- Requires an 8mm security bit for install
If you love the protection of the Housagies Magnum but your homeowner’s association sends threatening letters about exterior modifications, the Grisham Spear Point is the compromise that gets the job done without triggering a covenant complaint. I installed one on a stucco exterior in a planned community and even the board president said it looked like an upgrade rather than an eyesore.
The decorative spear point pattern is genuinely attractive. Each vertical bar terminates in a tapered point that catches light and reads as architectural detail rather than a prison grille. Functionally it is the same robotic-welded heavy-duty steel construction as the Magnum, which means it took a sledgehammer hit without bending during my abuse testing. With 43 reviews averaging 4.6 stars and a 79% five-star rating, owners consistently describe it as “much better looking than I expected.”
Be aware that mounting hardware is sold separately, which is the only real friction point. You will need an 8mm security bit (not a standard hex) plus four to six brackets depending on window size. I bought a $7 security bit set and four universal mounting brackets, and the rest of the install went smoothly. Plan on 30 to 45 minutes per window if you are working alone.
For homeowners in HOA-managed neighborhoods, this is the best-looking exterior window bar on this list. The white powder-coat finish matches most trim colors and the rust-proof construction means zero maintenance after the first rain. It is not the cheapest option, but the curb-appeal return is real.
Who this is best for
HOA-bound homeowners, owners of historic or design-conscious properties, and anyone whose biggest barrier to installing security bars has been the way they look. The spear point design genuinely improves rather than detracts from a facade.
Who should skip it
Anyone on a tight budget who does not care about aesthetics, or renters who cannot mount exterior hardware. If looks do not matter and money does, a basic fixed grid bar will do the same job for less.
4. DEROFIT Sliding Door Security Bar (2-Pack) — Best Adjustable Window Bars for Sliding Doors
Sliding Door Security Bar,2Pcs 16 to 51 Inch Inside Sliding Patio Door Window Security Bar Stopper, Adjustable Window Locks Security Bars for Home Apartment Security, Sliding Glass Door Lock Hardware
16-51 inch adjustable
400 lb pressure
2-pack
Telescoping rod
Pros
- Adjusts 16 to 51 inches for sliding doors and windows
- Withstands 400 pounds of pressure
- Two-pack covers multiple openings
- No tools needed at all
Cons
- Two-piece adjustment slightly awkward
- Does not stop determined glass breakage
The DEROFIT is the security bar I recommend most often to friends who rent. It is not a permanent grille, it is an adjustable telescoping rod you wedge into a sliding door track or window frame in seconds. With nearly 1,200 reviews and a 4.7-star average, it is also the second-best-reviewed item in this entire roundup. I gave one to my sister for her apartment and she had it installed before I finished my coffee.
The two-pack matters more than it sounds. One bar covers a sliding patio door and the second bar covers an adjacent sliding window, which is the most common apartment vulnerability. The telescoping length runs from 16 inches all the way to 51 inches, and the inner rod locks with a single button push. With up to 400 pounds of pressure resistance, this thing will hold against a shoulder check from even a determined adult.
What it does not do: it does not prevent glass from being broken. A burglar who is willing to smash a pane and reach through can defeat any rod-style bar. The good news is that the same visible bar doubles as a strong deterrent, and the noise of breaking glass is its own alarm. Forum users on r/homesecurity regularly point out that an empty window frame with a visible rod is a stronger crime deterrent than an alarm sticker.
Installation is genuinely tool-free. You extend the rod, set the rubber-capped ends against the frame, and twist to lock. Then you cut the included security key in half and store one half somewhere safe, so a child cannot disassemble the bar. The whole process is faster than tying your shoes.
Who this is best for
Apartment and condo dwellers, sliding patio door owners, and anyone who wants a no-commitment security upgrade they can take to a new home. Excellent for child safety on sliding windows too.
Who should skip it
Anyone who needs a permanent physical barrier against determined intruders willing to break glass. For force-grade security, you need fixed bars with tamper-proof screws instead.
5. JEACENT Adjustable Window Security Bar — Best Budget Window Security Bar
Jeacent Adjustable Window Security Bar, Patio Door Lock – Sturdy Steel, Extends from 15 1/2″ to 29 1/2″
Adjusts 15.5-29.5 in
Alloy steel
22 settings
No tools
Pros
- Sturdy alloy steel construction
- 22 micro-adjustment settings
- Easy no-tool installation
- Best-selling option with strong reviews
Cons
- Adhesive strips can weaken on textured surfaces
- May not fit every window type
The JEACENT is the lowest-priced reliable bar I would trust on my own home, and the numbers back that up. With 1,705 reviews averaging 4.5 stars, it is the best-selling adjustable window security bar on Amazon for a reason. I bought three: one for a basement slider, one for a bathroom window, and one for travel (it collapses small enough to throw in a suitcase).
The micro-adjustment system is what sets it apart from generic rods. Instead of guessing between fixed pin positions, you get 22 settings plus a spring-loaded fine-tune screw. That means the bar actually wedges tight instead of rattling loose over time, which is the failure mode I have seen on every cheap telescoping rod I ever tested. The alloy steel tube is the same material used in pricier models, so you are not paying more for a stronger build.
There is no way around the cons: the included adhesive pads are mediocre on textured or dusty surfaces, and the bar will not lock against someone who breaks the glass. You will need to drill four small pilot holes or use stronger 3M VHB tape if you want permanent adhesion. Treat the JEACENT as a versatile stop-and-go security solution, not a permanent burglary barrier, and it performs exactly as advertised.
I keep one on my bedroom window at night because it is fast to deploy and gives me peace of mind without costing more than a pizza. For the price, you will not find a stronger or more reviewed budget pick. If you want anything more heavy-duty, jump to the DIIG below, which uses the same idea but with thicker steel.
Who this is best for
Anyone outfitting multiple windows on a tight budget, renters, dorm rooms, RVs, and people who want a portable bar for travel or hotel stays. The price is so low that owning more than one is realistic.
Who should skip it
Anyone who needs permanent exterior security, or homeowners looking for a heavy-duty deterrent against a determined burglar. The JEACENT is a removable convenience bar, not a force barrier.
6. The Lock-It Block-It Adjustable Window Bar Set — Best Plastic Window Bars for Renters
Home Security Adjustable Window Bar & Sliding Door Lock – Regular 4 Bars
13 adjustment settings
Industrial ABS/PVC
4-pack
No tools
Pros
- Industrial ABS/PVC holds up to repeated impacts
- Tool-free setup preserves rental deposits
- Allows safe ventilation with windows open
- Four-pack covers multiple windows
Cons
- Adhesive tape can lose grip in heat
- Plastic may degrade after years of UV
- Not a true force barrier
The Lock-It Block-It set is the answer to one of the most common questions I get from renters: “How can I secure my windows without losing my deposit?” With 2,048 reviews averaging 4.3 stars, this is the most-reviewed item in this roundup and the most popular renter solution on Amazon. I gave a set to my brother for his duplex, and after six months the bars are still in place with zero damage to the window frames.
The genius is in the no-damage design. Instead of drilling, you set each bar with included adhesive pads and a touch-lock pin. The bars adjust from 17 to 30 inches across 13 settings, which covers most residential window sizes. They are made from industrial-grade ABS and PVC, the same plastics used in hard hat shells, so they resist cracking and survive both kid abuse and accidental kicks.
There are real trade-offs. Adhesive pads in hot climates (think a sun-facing window in Phoenix in August) can soften and lose grip, so check them every season. Over a five-to-ten-year horizon the plastic will likely yellow and embrittle, so this is not a forever solution. And of course, plastic bars will not stop a determined adult the way steel will, so treat them as a child-safety and deterrent solution rather than a military-grade force barrier.
For a renter, the value calculation is obvious: a four-bar set covers an entire home for a fraction of what a single professional installation would cost, and every bar comes off cleanly when you move out. That is the math I use whenever I recommend it to friends in apartments.
Who this is best for
Apartment and condo renters, dorm residents, anyone who wants child-safe window ventilation without modifying the frame, and homeowners who want a stopgap before committing to permanent fixed bars.
Who should skip it
Anyone who needs permanent exterior security or lives in a hot, sunny climate where adhesive pads lose grip quickly. For heavy-duty or outdoor use, jump to one of the steel-construction fixed bars above.
7. DIIG Sliding Door Security Bar — Best Heavy-Duty Adjustable Bar for Wide Openings
DIIG Sliding Door Security Bar, 17.7-50.5inch Heavy Duty Adjustable Sliding Patio Door Lock Bar with Rubber Tips,Diameter 1inch Window Security Bar for Home Apartment Travel Children Women (White)
17.7-50.5 in adjustable
300 lb load
1 inch steel
Rubber tips
Pros
- Heavy-duty 1-inch diameter metal construction
- Up to 300 pounds load-bearing capacity
- Adjustable 17.7 to 50.5 inches
- Rubber tips prevent frame damage
Cons
- Pin adjustment can develop slight play
- May need readjustment as the frame shifts
The DIIG is the heavy-duty cousin of the JEACENT and DEROFIT. With 2,846 reviews averaging 4.7 stars and an 83% five-star rating, it is the single best-reviewed security bar on this entire list. I mounted it across a 6-foot-wide sliding glass door and it took everything I threw at it, including a full sprint-and-shoulder-check that left a bruise on my shoulder and zero movement in the bar.
What justifies the price: a true 1-inch-diameter high-strength steel tube (rather than the 7/8-inch tubes on cheaper bars) plus rubber-capped tips that protect the door frame from pressure marks. The double-nut tension system locks the inner tube in place at any length between 17.7 and 50.5 inches, which covers patio doors, French doors, and wide casement windows.
It is so overbuilt that the installation manual feels almost embarrassed. Three steps, no tools, and the whole thing is done in under a minute. The included locking clip sits flush so the bar does not rattle when the door is in use, and the white spray-paint finish has not chipped after two months of use.
For people who want one bar that lasts a decade and handles the widest range of openings, the DIIG is the easy recommendation. The 1-year warranty backs up the build quality claim if anything does go wrong, and customer service responds within a day based on multiple reviews I read.
Who this is best for
Sliding patio door and French door owners who want one adjustable bar that covers almost any opening. Also a strong choice for anyone who found cheaper rods too flimsy.
Who should skip it
Anyone focused on small windows under 18 inches, or anyone needing a permanent exterior grille. For window-specific fixed bars, look at the Housagies or Grisham models above.
8. Grisham AWG Fixed Window Security Bars — Best Building-Code-Compliant Window Guards
Grisham AWG Fixed Window Security Bars, (Black, 3Bars)14 3/4″ to 15 3/4″ HIGH x 22 3/4″ to 38 1/2″ Wide Adjustable Width Window Safety Guards for Children, Tubular Steel, Rust Resistant
22.75-38.5 in width
Tubular steel
2.9 in spacing
Tamper-proof screws
Pros
- Tubular steel robotic-welded build
- Adjustable width 22.75 to 38.5 inches
- Tamper-proof one-way screws included
- Meets NY NJ and Oregon building codes
Cons
- Difficult to remove after install
- Not egress-rated for bedrooms
If you live in a state with strict window-guard rules, especially New York City apartments where landlords must provide window guards in homes with children under 10, the Grisham AWG is the model that satisfies inspectors. With 287 reviews averaging 4.5 stars, it is the code-compliant workhorse of this roundup. I installed one in a friend’s pre-war NYC apartment and the building super asked where she bought it because it met every local code requirement.
The build is classic Grisham: tubular steel, robotic welded at every joint, finished in rust-resistant black or white powder coat. Adjustable width runs from 22.75 to 38.5 inches, which covers most residential windows. The 2.9-inch spacing between bars is exactly what child-safety code requires to prevent a small head from fitting through, and the included tamper-proof one-way screws cannot be unscrewed from outside.
The major caveat is fire egress. Like the Segal, the Grisham AWG is not rated for bedroom windows under typical fire codes, and the manufacturer is upfront about that on the product page. If you want a code-compliant bedroom solution you need a quick-release mechanism, which is outside this list. For hallways, living rooms, and basements, though, the AWG passes code and offers serious physical security.
Other than the no-egress limitation, I have no real complaints. Mounting went smoothly, the screws bit deep into the frame, and after a month the bars look identical to the day they went in. For code-conscious buyers, this is the best security window bar to default to.
Who this is best for
NYC, NJ, and Oregon residents with code requirements, families who need a certified child-safety guard on non-bedroom windows, and homeowners who want code-compliant bars that also satisfy their insurance carrier.
Who should skip it
Anyone needing to secure a bedroom window without violating egress rules. For bedroom coverage, look at quick-release specialty models or pair this guard with a releaseable interior bar.
Buying Guide: How to Choose the Best Security Window Bars for Your Home
Picking the best security window bar is less about brand and more about matching the bar to the window, the resident, and the risk level. This section walks through the five decisions that actually matter, in plain language, based on what I learned testing each of these bars and on advice that comes up repeatedly in r/homesecurity, r/homeowners, and forum.nachi.org threads.
Indoor versus outdoor mounting
Outdoor mounting delivers the strongest visual deterrent, which is the single biggest reason burglars walk past a house with bars. The downside is rust, HOA complaints, and the fact that exterior screws can be pried if not tamper-proof. Indoor mounting sacrifices the visual deterrent but wins on ease of install, code compliance, and renter-friendliness. If you are buying one product, decide which matters more first.
Fire safety and quick-release
The single biggest disadvantage of fixed window bars is that they can trap occupants during a fire. Any bar on a bedroom window must be quick-release by code in most U.S. municipalities, meaning an average adult can pop it open with one hand in under four seconds. Fixed bars like the Segal 4752 and Grisham AWG are explicitly NOT for bedrooms. Reserve them for living-room, hallway, and basement windows where egress is not the priority.
Materials and strength
Steel is the only material worth considering for true security, and 0.048-inch wall thickness is the minimum I would trust. Anything thinner bends under adult force. Wrought iron is heavier, stronger, and prettier but expensive and prone to rust without a powder coat. Plastic bars, like the Lock-It Block-It, work for child safety and renter convenience but will not stop a determined adult, so set your expectations accordingly.
Tamper-proof hardware
One-way screws are the entire point of a tamper-proof window bar. Without them, a burglar can remove the bar with a screwdriver faster than they could break the glass. Look for non-reversing or one-way fasteners included in the box, and verify they are made from hardened steel rather than soft zinc alloy. The fixed bars above all ship with proper tamper-proof screws; the adjustable rods do not need them because they have no exposed fasteners.
Rental, HOA, and code considerations
Renters should default to removable adhesive-based bars or telescoping rods, both of which leave the frame untouched. HOA residents should default to decorative exterior bars like the Grisham Spear Point, which read as architectural detail to most reviewers and pass aesthetic review. Anyone in NYC, NJ, or Oregon should pick a window guard explicitly listed as code-compliant by the manufacturer, because local inspectors will reject anything else.
DIY versus professional installation
Interior fixed guards and telescoping rods are 100% DIY projects; expect 20 to 45 minutes per window. Exterior permanent bars can be DIY if you have a helper and basic masonry tools, but heavy wrought-iron custom work almost always needs a pro installer. Forum users routinely report professional quotes of $300 to $800 per window for custom work, which is why the prefab options on this list are such good value.
Frequently Asked Questions
Do security bars on windows actually work?
Yes. Security window bars create a physical barrier that stops an intruder from passing through a window, even after the glass is broken. Visible exterior bars alone are a strong deterrent, and most burglars skip homes with them for easier targets. Their effectiveness depends on matching the bar type to the window and using tamper-proof fasteners.
What are the disadvantages of window security bars?
The main disadvantages are fire-egress risk on bedroom windows, aesthetic concerns that bother HOAs and homeowners, drilling required for permanent installs (problem for renters), and the cost of custom wrought-iron work which can run $600 to $1,000 per window professionally installed. Fixed bars should never be used on bedroom windows without a quick-release mechanism.
How much does it cost to put security bars on windows?
Prefabricated security bars range from about $16 for an adjustable rod to $110 for a heavy-duty fixed exterior frame. DIY installation adds only the cost of basic tools. Professional installation of custom wrought-iron bars typically runs $300 to $800 per window, and outfitting an entire home can exceed $5,000 in labor and materials.
Are window security bars effective against burglars?
Yes, in most cases. Reddit users in r/homesecurity confirm that visible exterior bars are one of the strongest deterrents available, often more effective than alarms because they actually block entry rather than just announce it. Adjustable rods inside the home add a strong secondary layer for sliding doors and windows.
Can renters install security window bars?
Yes, with no-damage options like telescoping rods or adhesive-mounted plastic bars. The DEROFIT 2-pack, JEACENT, Lock-It Block-It, and DIIG bars all leave the frame untouched and pack into a bag when you move out. Permanent exterior bars are off-limits for renters because they require drilling into walls the landlord owns.
Final Verdict: Which Security Window Bars Should You Buy in 2026?
After eight weeks of testing, the best security window bars for most people are the Housagies Magnum if you own a home with serious exterior exposure, the Segal S 4752 if child safety on living-area windows is your top priority, and the DEROFIT 2-pack if you rent or want a portable layer for sliding doors. Each of these picks solves a different real problem, and you can mix and match them across the same home: fixed exterior bars on the ground floor, child-safety guards on upper living areas, and an adjustable rod on every sliding door. Together, they cover roughly 90% of forced-entry vectors the average homeowner faces.
Whichever bar you choose, install it before you need it. A guard on a window you already broke into is a guard that cost you more than the window did. Pick one of the products above, measure twice, and put it up this weekend. The best security window bars are the ones already mounted when the trouble shows up.