High-quality materials our automatic door lock is made of a high-quality solid aluminium alloy. The surface is treated with high temperature paint, which is strong and durable, not easy to and very safe.br Automatic rebound - The inside of the lock is spring-loaded. 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 to the locked state.br 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 appropriate, the door latch can be automatically locked after closing the door.br installation methods It can be installed over the door or on the side of the door. The main body of the latch can be attached to the door or door frame please note the opening direction of the door. Incorrect installation may affect the practical effect.br Wide application the automatic spring lock can be used for all doors or windows that need to be opened frequently and have low safety requirements, back yard doors, windows on high floors and bathroom doors..Items from Sheng Xinshun's shop