Safety Locks: This sliding window stopper is designed for home and office use, allowing you to keep windows partially open or fully closed to help prevent children and pets from climbing through. It also helps deter unauthorized entry. These universal locks fit most hinged or sliding doors and windows, providing secure locking or window opening limitation. Sturdy Material: Made from aluminum alloy, this sliding window lock is durable and rust-resistant, with reusable construction. Includes plastic gaskets to help prevent scratches or damage to glass surfaces. Features a hardened steel bolt for reliable locking in either closed or ventilated positions. Includes two brackets suitable for narrow and full-size window frames. Recommended for use with wood casement windows. Easy Installation: This key-operated window lock installs in just three simple steps. No tools or drilling required. For added security on heavier windows or doors, use with double-hole mounting.