Sliding Window Locks (6 Sets), Security Window Locks with Keys, Adjustable Aluminum Sliding Window Stops, Easy Installation Without Drilling, for Vertical and Horizontal Sliding Windows (Silver)

I took measurements first to make sure they fit. Attached them on the same day of arrival. They seem sturdy and were easy to attach. Bought them after a neighbor's cat fell out of their window in the eighth floor and died despite a fly screen being attached. I live even higher up. Just want to make sure neither a guest nor maintenance will ever open my windows further than a kitty can get through.

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I’m on a lower level apartment and like to have windows open at night. These locks fit my windows perfectly and are very durable. Highly recommend this product for extra security with windows.

The first question you should ask yourself when you buy this is why are you securing your window. Is it to keep someone from inside from opening the window to go out, is it keep someone from outside opening the window to come in, or both? Honestly it works for either.If the use case is the former, it would have been better to not use a hex socket screw as it's very easy to find the right tool to turn these in a standard bit driver set. A security screw (or tamper proof fastener) would have been better but probably added cost.I do like the hex nut option when you install it backwards, but it doesn't fit that way on all my windows. None the less I'm happy with the purchase and will buy more to finish installation on the windows.Note that not being able to open a window could be considered a fire safety issue, so plan accordingly.

Good solid security products have 6 windows and ordered the package of 6.

Work great

Good

The product works ok. Not what expected