This 2-pack door reinforcement lock adds an extra layer of protection to inward-opening doors. Built from aluminum alloy with a built-in rubber bumper, it is designed for durable, quiet operation and can withstand up to 800 lbs of force. The spring-loaded design allows quick locking and unlocking for everyday home security. It is suitable for apartment, bedroom, front, back, and patio doors with a door gap of at least 0.1". Installation is simple with the included screws.