Works particularly well when installing locks on both the bottom and top rails against a closed sliding window (or sliding door). I placed the bottom lock on the center rail for maximum effect on the door and window. I was able to install the insert and attach it to the rail at just over 0.2" thick, slightly more than the advertised 3/16". They didn't budge when I tried to force the panels open. When mounted 2 inches from a closed panel (to allow for a partially open window) I was able to get them to slip a little by repeatedly opening the window, but only a few millimeters or so at a time. An intruder would rather break the glass before you go to all that trouble.
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