Safety Locks: This sliding window stopper for home and office, you can keep the windows open or closed to avoid a hidden risk of children and pets climbing the window. Also, it keeps burglars out. These universal locks are designed to fit most hinged or sliding doors and windows. They are used to lock the window or limit the window. Sturdy Material: Aluminum alloy sliding window lock, durable and anti-rust, reusable. Comes with plastic gaskets to prevent scratches or damage to glass. Hardened steel bolt offers snap lock in closed or vented position, 2 brackets for narrow fenders and full size fenders. Recommended for wood wing windows.Easy Installation: This window locks with a key and quick 3-step installation. No tools or drilling required. Use double-hole locks in heavy windows or doors for added security.