Brushed Steel Treatment: The anti-theft chain lock is made of stainless steel, sturdy and durable, not easy to fade and corrosion resistant. It ensures your safety and has a long service life. The three-layer brushed surface resists daily scratches, impacts and kicks. Safety Lock: There is a button with a spring-loaded anti-theft button. The chain can be opened by pushing the buckle, effectively preventing unauthorized people from falling off the chain and touching the internal hook. This design will lower the chain and protect your home more firmly, making it safer. Thick Chain Design: The 3mm thick chain is durable and not easy to break even if pulled hard. It can be used for a long time. Easy to install: The kit includes a door safety chain and four screws that can be fixed behind the door. The chains can be used on all types of doors, whether wooden or metal, and can be placed above or beside the door jamb. (The greater the distance between the buckle seat and the base, the