1.STAINLESS STEEL AND BRASS MATERIAL: The door lock is made of stainless steel and brass, heat-treated and hardened to prevent violent unlocking, impact strength and fracture strength. 2.EQUIPPED WITH 5 KEYS: The outdoor door lock is equipped with 5 keys to prevent loss. The key is thickened to prevent twisting and breaking, and the lock is soft. 3.TOUGH AND WEAR-RESISTANT: The security lock is tough and wear-resistant, comfortable to touch, easy to clean the surface of stains and dirt, and easy to use. 4.EASY TO INSTALL: Multi-security locks are designed to be simple, beautiful and easy to fit into your home decor. Easy to install, to ensure that your family practical practical peace of mind. 5.SUITABLE FOR DORMITORY DOORS: Door locks are suitable for dormitory doors, access doors, school projects, construction projects, hotel projects, etc.