Product Description Durable Construction: All metal construction made from premium stainless steel. For quality, durability and rust proof. Door locks are difficult to rust or oxidize and will serve longer life. Security Locking Device: Door bar latch for hinged swing-in doors, opens entry for safe viewing against intruders Child Safety: Out of reach bar catch prevents children from opening the door themselves for child-safe door security Easy Installation: Door reinforcement lock has a long, swing bar, which folds over the closed door. Installation is quick and easy with the screws in package, the process is simple enough that almost any homeowner can do it easily in minutes. Advanced Craft: Steel ball positioning features holds locking arm in place so they will not swing around for extra security.