4-piece door or window jammer lock Good secondary security protection, Installing window jammers on your doors and windows can give your kids and pets a good protection and make your life safe, happy and comfortable Easy to install The jammer lock is equipped with matching set screws for easy installation and can be rotated 90 degrees, simply twist the jammer arm to lock or release Includes anti-wear pads to reduce wear and tear on the jammer. It also reduces friction between the jammer arm and the window, protecting your window or door from scratches
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