2pcs Window Locks Set for UPVC Windows,Window Restrictor Locks for Children Security with Screws Keys

Very good and installed on several windows in my home

Good to prevent window from opening. Super sticky, that's not going to budge anywhere and good quality. Not going to stop someone with professional cutter, but will stop a toddler from opening the door or window too far. White ones belend in and look good with white UPVC. Work as described, but keys seem universal.

Excellent product, easy to fix to the windows.

Perfect for added window security + child safety ✅ Pros • Quick and easy to fit on uPVC windows • Feels solid and secure once installed • Great for ground floor security • Lets you keep windows slightly open for ventilation • Helps with child safety by preventing the window opening fully • Handy 2-pack for multiple rooms ❌ Cons • Needs to match your window style/size (worth double-checking before ordering) • Instructions are basic, but it’s still straightforward Overall: Simple, strong and gives real peace of mind — especially with kids at home. 5/5.

I used this for a double glazed window because the hinges don’t work properly and this was the cheapest way of keeping my window open without it flapping around in the wind. It also doubles as extra window security. Unlike me, make sure to line this up with the window open and then closed to make sure it fits as I stuck it too close to the frame and the window would not close. I had to use a knife to pry it off and it had only been stuck on a few seconds so the sticky part of this works really well. Because I messed up the sticky I had to use the screws to fasten it in place. So I tested both stick and screw methods and both are really good. Obviously I am no good at DIY but I got there in the end and would recommend this product to family etc.