Door Reinforcement Lock, 3 in. Stop, Aluminum Construction, Satin Nickel Anodized FinishThis is a door reinforcement lock that protects against unwanted and unauthorized entry. It prevents lock bumping or lock picking in the locked position. Designed to withstand 800 pounds of force. There is no way to open this lock from the outside of the door and installs in minutes. Fits any swinging door, is tamper resistant, and is a child safe design. Used on swing in doors to protect against unauthorized entry by preventing lock bumping and lock