Defender Security 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

Why I picked this guard

I wanted a simple, code-friendly barrier to keep kids from tumbling out of open windows while still letting me crack them for fresh air. The S 4752 guard hits that brief: it’s a fixed, non-egress design with a telescoping width that covers a wide swath of common interior window sizes (23-1/2 to 38 inches wide) and a low-profile height of 15-1/4 inches. It’s built from 0.048-inch carbon steel tubing with 3-7/8-inch bar spacing, which satisfies the common “4-inch sphere” child-safety guideline. It’s also approved under NYC and NJ housing codes, which I take as a good sign that the dimensions and bar spacing are well thought through for child-fall prevention.

Just as important, it’s meant for interior use and ships with one-way, tamper-resistant screws. That tells you who it’s for: caregivers who need a permanent safety barrier on windows that are not required for emergency egress. If you need to be able to open or remove a guard quickly, this is not the one.

Build and design

Out of the box, the steel tubing is straight, square, and cleanly welded. The white finish looks like a durable coating, and it blended nicely with my vinyl frames and white blinds. The telescoping frame adjusts smoothly before mounting and locks up tight once installed—no rattle, no play.

At 0.048 inches thick (roughly 18-gauge steel), this is more “child-safety grade” than “prison bar grade,” which is appropriate for the product category. From a security perspective, it’s a meaningful deterrent against casual intrusion, but it’s not a substitute for a dedicated, heavy-duty security grille. If you’re expecting this to stop a sustained pry or a boot with full body weight, you’re asking it to do something it wasn’t designed to do.

A small design note: the telescoping seam is visible once installed. It’s discreet, but it’s there. The overall look stays tidy and doesn’t scream “afterthought,” especially on white windows.

Installation experience

I installed two guards: one high on a second-floor hallway window (so I can open the top sash safely) and one across a basement slider that’s not designated for egress. Each took about 20–30 minutes with careful measuring.

What I used:
- Tape measure, level, and pencil
- 1/8-inch pilot bit (wood jamb)
- Impact driver and a hand screwdriver
- Stud finder and 2-1/2 to 3-inch screws (my own)
- Automotive masking tape to protect the finish while handling

Fit and prep:
- Measure the clear interior width between jambs at the exact height where you’ll mount. The S 4752 adjusts 23-1/2 to 38 inches before you fasten it.
- If you have drywall returns or flimsy extension jambs, add blocking or aim for solid wood framing. Screwing into vinyl liners or hollow PVC isn’t a great idea.
- On masonry, you’ll need proper anchors; the included screws are for wood.

About those screws:
- The included one-way, tamper-resistant screws do what they promise (hard to remove), but they’re fussy to install and unforgiving if you misalign a hole. I tried them on my first guard and then switched to heavy-duty Torx security screws for the second. The difference in control is night and day. If egress isn’t required and your local code doesn’t mandate one-way fasteners, using quality structural or security Torx screws will make your life easier and the install stronger.
- If you do use the included screws, pre-drill carefully, drive them with steady pressure, and use a hand screwdriver for the final quarter-turn to avoid stripping.

Mounting tips:
- Adjust the guard width so the end brackets sit fully on solid jamb surfaces. Dry fit and mark holes with a level.
- Pre-drill slightly undersized pilot holes to keep screws straight and prevent splitting.
- Keep the guard high for double-hung windows if you plan to open the top sash. With the bar centered over the upper opening, you get airflow while preventing a climb-through.
- On sliders, you can mount the guard vertically to span the opening, but confirm that the bar spacing and screw locations still land on solid material and meet your local code interpretation.

Noise and movement after install: none. The frame tightened up nicely and stayed square.

Everyday use and safety

The guard does exactly what I need: it keeps an open window “kid-safe” while allowing reasonable ventilation. I tested with firm adult pressure; the frame flexes minimally and rebounds without any creaks. The 3-7/8-inch spacing is tight enough to prevent head-and-shoulder passage but wide enough not to feel claustrophobic.

The non-egress design is the defining characteristic. Once it’s on, it’s essentially permanent without destructive effort. That’s good for preventing tampering; it also means you must plan around fire safety. I did not mount these on any bedroom windows. If a window is part of your emergency exit plan, use a hinged/quick-release version designed for egress.

Where it makes sense—and where it doesn’t

Ideal scenarios:
- Second-floor hallways, bathrooms, and living spaces where you favor ventilation but don’t rely on that window as an escape route.
- Basements with hopper or slider windows that are not designated for egress.
- Homes that need a child-fall barrier meeting recognized spacing and dimension practices.

Less ideal:
- Bedrooms or any room where code requires an operable egress window. Choose a hinged or quick-release guard instead.
- Windows that need a high-security grille. This is a robust child-safety product, not a heavy-duty burglary barrier.
- Exterior mounting. It’s designed for interior use, and exterior exposure will shorten the coating’s life and complicate tamper resistance.

Sizing and coverage notes

At 15-1/4 inches tall, one guard covers a small to moderate opening. For tall openings, stacking two seems obvious, but it can create misaligned bar spacing and overlapping feet that look awkward. I had better results pairing this size at the top with a taller, compatible model from the same line at the bottom, preserving alignment and aesthetics. If you only need to secure the top sash opening, one S 4752 positioned high is often enough.

What I’d change

• Hardware: The included one-way screws match the tamper-resistant intent, but they make installation harder than it needs to be. Either include a better driver or offer a Torx security screw option with the same tamper goals and a better user experience.
• Packaging: My screw bag had torn loose in transit. Everything was present, but a sturdier attachment would help.
• Height options in the same finish: A bundled kit that pairs this 15-1/4-inch unit with a taller companion sized to keep bar spacing aligned would make multi-guard installs cleaner.

Value

For the price, you’re getting a steel, code-minded guard that installs cleanly, looks decent, and provides real child-fall protection. It outclasses the flimsy spring-loaded “window stops” I’ve tried and costs far less than custom bars. As long as you understand the non-egress limitation and the intended use, the value is strong.

Alternatives and adjacent options

• Hinged/egress versions: If you need the ability to open or remove the guard quickly—especially on bedroom windows—go with a hinged model with an approved quick-release mechanism.
• Heavy-duty security grilles: For break-in resistance, look for thicker tubing, tighter mounting plates, and a product expressly rated for security, not just child safety.

Bottom line

I installed the S 4752 to reduce the risk of accidental falls while keeping certain windows usable, and it’s been solid. The steel construction and 3-7/8-inch spacing inspire confidence, the adjustment range covers most standard interior widths, and the finish blends into typical white trim. Installation is straightforward if you pre-drill and mount into real framing, but I’d plan on using your own quality screws unless you specifically need the included one-way hardware for tamper resistance.

Recommendation: I recommend this guard for child-fall prevention on interior windows that are not part of your emergency egress plan. It’s well-built for its purpose, meets key code considerations, and offers good value. If you need quick-release capability or true anti-burglary performance, choose a hinged egress model or a heavier-duty security grille instead.