Tahikem 4 Sets Sliding Window Locks, Security Window Double Lock with Key, Aluminum Window Stoppers for Vertical & Horizontal Slide Door, Adjustable Security Locks for Child Double Hung Windows

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These double locks are very well made, and the rubber strips on both sides of the lock make it hold stronger than others.UNFORTUNATELY, my windows have this fuzzy stuff that helps seal the windows, which would get crushed and damaged by using these locks. (The picture is looking down on the track) Just make sure your windows don't have this fuzz before purchasing the locks. Since I already attached the rubber strips I can't return them.

i have a portable AC unit; the exhaust hose ventsnthrough a window. these locks work so well, nobody can open the window. a neighbor had a break in with his old locks, so i shared with him (two windows each). we both feel quite secure

The primary reason I bought this lock set vs others was inclusion of the vertical key.Without it.....It really didn't make sense for me to have outside allen wrench bolts showing to a potential robber. All they would need to do is go to their car (potentially), grab the correct size and come back and break in!Thus I wanted to be able to lock the window from the Inside track...which I was able to accomplish with the Vertical Key.If you didn't have the vertical key, the bend in the allen wrench is prohibitive to tightening down the blots.Essentially....I bolted the outside window on it's track, facing the bolts towards the inside.Then bolted the internally facing window on it's track facing the bolts inwards as well.Very happy.....just concerned that the vertical key is NOT that resilient from what I can tell....so I tightended the bolts very gingerly!!

Needed a non permanent safety lock for my kids windows and these did the trick. I saw the ones that attach to the windows but read that they are somewhat faulty. These ones are great. I put them on the top of the window so my kids can't get the key and then I tested them out. THEY DONT BUDGE. They are easing this mom's anxiety of children falling through a window