Install easily: each lock is equipped with a key, no extra tools needed, you just need to use the key slowly through the hole and hold on the track by key control.The locks are made of aluminum alloy, and rust proof, can serve you for long time usingUsed to secure sliding window in a closed or ventilating positionThumb turn screw secures lock in placeVarious usages: the window locks can be applied to keep windows partially open or closed, enhancing circulation, preventing burglars from entering or keep your kids safety; Fits for most vertical or horizontal sliding windows and doorscolor:SilverMaterial:Aluminum alloyPackage Contents:36 x Sliding window locks with keysOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.