Window locks designed for horizontal sliding windows, vertical sliding windows, and sliding doors such as patio doors, sliding glass doors, and sliding windows. Not suitable for plastic window frames. Sliding window lock for home and office use, you can keep windows partially open or closed to avoid any hidden dangers that children and pets might climb on the window. It also prevents burglars from entering. Before purchasing these security locks, please make sure that the thickness of your window track does not exceed 16 mm and the track height exceeds 15 mm. (Note: Not suitable for tracks in the middle of the window). The 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 heavy windows and doors for added security.