Fits most hinged or sliding doors and sash, providing reliable protection for your baby or child. Made of aluminum alloy for durability and long lasting security. Keyed entry adds control and an additional layer of security, with 2 keys included. For maximum security, install at the and bottom of the door as recommended. Practical and straightforward to use, designed to keep doors securely protected without compromising everyday access. Compatibility and performance: designed to fit a wide range of door types and sashes while delivering dependable protection. Use scenarios Nursery or playroom: install on doors leading to stairs, kitchens, or other hazardous areas to prevent curious children from accessing restricted spaces. Sliding patio or balcony doors: keep young children from opening exterior doors and wandering outdoors while you stay close by. Interior room access: place on doors to bedrooms, utility rooms, or garages where you need occasional controlled access for safety.