Screw-in Design: Each child window lock features two mounting holes that greatly enhance the holding power of the lock. You can easily secure your window/door or allow ventilation by tightening the lock clockwise with the included hex key. Comes with rubber padding to prevent scratches or damage to the window and improve window safety. High Quality Material: The window lock is made of solid and reliable aluminum alloy with exquisite workmanship, is safer and can serve you for a long time of use. You can fix the window in place so that it cannot be pulled or opened, and multiple locks can be applied to various windows or doors at the same time to increase security. Easy to Install: Sliding window lock no need for additional installation tools or drilling required, quick installation in 3 steps. Just place the lock in a suitable position and tighten the screws! 4 sets of secure window locks can be reused, and even women or the elderly can also easily complete this installation process