1 X Lot of 4 Pcs Sliding Window Lock (12 Pack)

I bought this set of 4 sliding window locks to add extra security to the windows that have an air conditioner, and they work perfectly! They are sturdy, easy to install, and keep the window locked in place without any hassle. Now I have peace of mind knowing the window can't be opened from the outside. A simple but effective solution—highly recommend!

These are well constructed, easy to use, and an inexpensive supplement to secure your windows and sliding doors from unwanted visitors; I would use them in addition to other security measures. Worth the money for peace of mind.

Works great on metal framed horizontal sliding windows. Mounting of these locks are on the frame (fin) of the sill, tightly against the window frame itself. Screw down the lock as tightly as possible to the fin on the sill. It works by blocking the sliding window from sliding open.I removed 1 star because the screws on these are a bit too short. So if your frame fin isn't at least 1/8" thick, the screw wont be long enough to tighten on the frame. Be sure to push the block up against the sliding part of the window as close as possible. And tighten the screw as tight as you can by hand. The screw digs into the metal sill a bit to hold it in place. It's usually best if you screw one down on the top and bottom of the sill as this will keep the window tightly closed and unmovable. That also works great where kids can't reach the top one to remove it.You should only use these on sturdy metal window frames and sills that have metal fins sticking up to hold the window pane and frame in place so it can't slide. They mount on the sill not the actual window. You can also put a measured piece of wood in the window slide track or from the sill to the window frame, further securing a sliding window from being opened.You should not buy these blocks if you have plastic sills or frames. The screw can crack plastic if too tight and just slide off if not tight enough. These are made to dig into metal sills and frames only. If they are in the direct sun, they could melt your plastic sill. They are not made for plastic.A burglar with a lot of time and an out of site location might eventually be able to pry your window and screen off to get around these. Or they could just break the window. But they would risk a lot of attention and make noise doing it. Most burglars don't want to waste time or risk detection by fidgeting and prying and would rather choose an easier to slide open window or your neighbor's unprotected ones. Your best burglary defense is always an alarm or vigilance. These are just used as a measure to not make it easy to quietly push a sliding window open.These can also be used to keep small children or pets from opening and falling out of windows. By having one on both the top and bottom sill, tightly screwed down, small children can't reach the top block.Another feature of these is to quiet horizontal sliding windows that loosely bump and rattle when wind blows on them. When used on the top and bottom of a loose fitting, closed sliding window, these can hold that window tightly to the sill, stopping the window from bumping and moving.I have several windows that have these installed on both top and bottom. They serve their purpose well.

Little extra security and great price for the set of 12. I keep my windows opened the majority of the time when I'm home. So they work on the bottom of the window as well to keep it from slamming down with a gust of wind. And most importantly to keep grandchildren's little fingers safe.

Works great - easy to work with... An outstanding feature to cheaply secure windows.

DurableEasy instillationSecurityLock functionality

5 years ago, I purchased some similar devises made with some sort of polyvinyl or plastic. They worked perfectly. They went missing in a move.Now, living in a ground floor apartment, I purchased these aluminum devises, thinking metal would be an even stronger block. Wrong! After tightening them as tightly as possible by hand, they simply slipped off when I put a little force on the window. Trying again, I used pliers to get those little suckers to hold. The bolts really dug into the vinyl frame. Nope!! Same thing happened. They popped loose!I think the problem is in the material itself. With my first set that worked so well, the material was more flexible. Screwing them on caused the entire devise to bend just enough that was pressure exerted all along and around the clamping devise. The entire surface of the clamp grabbed tightly against the window frame. With this second metal batch, there was little to no flexibility. In places, the clamp didn’t even touch the window frame. As a result, only the bolt truly gripped the frame. The surface area that gripped was so small, that movement against the window was sufficient to loosen the bolt, releasing the whole clamp.I taped a couple of wooden dowel rods into the window tracks as a stop-gap measure. They aren’t pretty, but they should work until I can order some vinyl clamps.My advise: save your $$; skip the metal ones because flexibility is better!

These are good, in theory. However, they don't work well on my windows.