Defender Security U 9927 Keyed Sash Lock: Child-Proof Protection for Your Home

SC: Really simple solution to adding some security for my windows. Works best when the 2 mounting surfaces are the same height and align. There is only a single position for lock and unlock. When your surfaces match it is very smooth and easy to lock and unlock.

United States on Nov 17, 2023

Gwendalenia: Makes sure you measure when you want to use these before you buy these. I’m sure all the macho handiman and internet Trolls will bash me with “Duh” and “no kidding sweet cheeks”

Because of my son’s elopement issues I had to install these on his windows. I don’t mean he keeps trying to elope with some woman. I mean my son is Autistic and tried to climb out his bedroom window one night. Every special needs parents nightmare.

I installed these and the back part is like a millimeter to wide and it covers the 2 frames so now even when I unlock it I can’t open the window.

I can’t return the ones I have. I have to find something with a slightly narrower back side to fit my son’s windows.

I’m not a particulary handy person so trying to screw these in was a pain for me. Maybe it won’t be if someone is more handy.

United States on Oct 09, 2023

Zachary: This was wayyy too big to fit on our windows. I missed the return window so now I’m stuck with a product that is worthless.

The fit was not even close. These are huge.

United States on Jul 07, 2023

Javier RJavier R: Fácil de instalar pero el material es frágil y los acabados no son de calidad, pero siento que cumple su funcio basica

Mexico on Apr 28, 2022

Norma: No quedó en mi puerta ni ventana corrediza

Mexico on Jun 03, 2021

Zzz: Cumple con la descripción del producto

Mexico on Feb 28, 2021

Twila Saylor: This worked for what I needed but it was a little to big I can't use it as your supposed to the window ain't coming open anymore tho so that's all I needed I have a 2 4 and 6 year old that kept taking the entire window out up stairs and throwing things out I'm just thankful they didn't throw each other out but this has solved the problem

United States on Dec 06, 2020

Salvador Nicolás Quezada: Excelente chapa de seguridad la recomiendo al cien % rápida su entrega y cumple con sus especificaciones gracias

Mexico on Jan 28, 2020

Alicia: great product but had a problem installing on one window because it was narrow.

Canada on Oct 11, 2019

An Informed Buyer: The product is well built, but the ease of closing it depends on installation. The two sides need to align perfectly. This is more tricky than it seems because the sliding window might not be flushed with the frame bar. In such case, add a shim to make it flush. Alignment issue is the reason why phillips screws are included in addition to the one-way tamper resistant screws. It might seem unnecessary to use the phillips screw first only to be removed and replaced with the one-way screws. But don't skip this important step because once the one-way screws go in, you can't remove them to adjust the alignment.

If you made mistake in drilling, or if you're replacing an existing lock and the old screw holes are not at the exact same location, you can easily cover up the old holes with Bamboo Skewer and wood glue. Then a new hole near can be drilled right next the old one without breaking up the wood. Drilling pilot holes is strongly recommended because it's so easy to crack near the edge.

The way the key works is slightly strange. There's no need to turn the key. Instead, just insert the key straight in, and then flip the latch...

United States on Dec 13, 2014