2 Pairs Window Restrictors Locks,Aongray Window Restrictor Hook Window for UPVC Stainless Steel 304 Security Lock Child Lock Restrictor Catch Safety Catch with Screws (Silver,2 Pairs)

Easy to fit and does the job.

These look excellent fitted to the top of our window frames. A little fiddly to fit dependent on the alignment of the window to the frame - some windows required spacers (not supplied) to be added under the hook to get things to line up. Once fitted the window can only open a few centimeters but can be unhooked easily to allow the window to open fully.

I got 8 of these , 4 from this seller. These were harder to fit for some reason . I think that's because the arm is not high enough to catch the pin. The biggest problem is that the catching Pin wobbles , so i suspect these will not last very long. They do work. after some fiddling about i got them in the correct positions. The rubber gaskets do help raise the pin up so that it can catch the arm....that is very useful

Having toddlers make these brackets a MUST to ensure the windows don't open all the way out. Easy to install with everything needed. Sturdy and work as required

The vent is of average quality while it does satisfy functionality it not well constructed hinging is poor vent closure is poor probably value for the price but if your looking for a quality finish look elsewhere

My German Shepherd had a habit of pushing the windows open and escaping during the summer. These solved that problem instantly, allowing us to keep the windows open a decent amount on hot days!

Useless for our windows ended up replacing the whole window mechanism and handles so we could just lock them on safety instead.

Easy to fit, work well. Best to watch the installation video before you buy to understand where you can fit them.