High Quality MaterialsOur automatic door lock is made of high-quality solid aluminium alloy and the surface is treated with high temperature paint, which is strong and durable, not easy to damage and very safe. Automatic rebound. The inside of the lock has a spring design. When you need to open the door, pull the ring, and when you close the door, loosen the ring, the internal spring is restored, and the door lock returns to the locked state. Automatic Locking when the Door is Closed: the end of the steel column in the door lock is designed with a 45° inclined surface. If the installation method is suitable, the door bolt can be locked automatically after the door is closed. Multiple Installation Methods: It can be installed above the door or on the side of the door. The main body of the latch can be installed on the door or door frame (pay attention to the opening direction of the door! Incorrect installation may affect the practical effect) Wide Application Automatic spring lock can be used for any door or window that often needs to be opened and which has low safety requirements, such as backyard doors, high-storey windows and bathroom doors.