??Stainless Steel Doo Safety Chain, Door Security Guard, Front Door Chain About Product: ??SECURITY LOCKING DEVICE – This Main Door Chain, Door Guard is a security locking device for doors, allowing a door to be slightly opened to allow safe viewing and ventilation. ??CHILD-SAFE SECURITY DEVICE – This door chain lock can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security. ??EASY INSTALLATION - Installation is quick and easy – additional security for your home or office doors. ??Door chain or Security Door chain consists of a small chain which is attached to the door frame, which attaches to a track on the door for security purposes. ??It is a type of Lock that is often used along with other types of locks to secure a door. ??Door chains are mainly intended to allow a person inside a structure to open the door slightly for purposes of communicating with individuals outside or exchanging small objects through the door while still preventing the individuals outside from gaining unauthorized access into the structure.