Window locks designed for horizontal sliding windows, vertical sliding windows and sliding doors such as patio doors, sliding glass doors, sliding windowsNot suitable for plastic window frames. Sliding window lock for home and office, you can keep the windows partially open or closed to avoid any hidden danger that children and pets could climb on the window. It also keeps burglars out. Before buying these security locks, please make sure your window rail thickness does not exceed 16mm rail height above 15mm. (Note: Not suitable for rails in the middle of the window). Sliding window locks are made of aluminum alloy, durable and rust-resistant, reusable. Comes with protective plastic gaskets to prevent scratches or damage to the window. Window lock with key, quick 2-step installation. No tools or drilling required. Use double hole locks in windows and heavy doors for added security.