This lock and door reinforcer assists in preventing forced entry. It is easy to install and accommodates key-in-knob lockets or deadbolts. This reinforcer is used on wood or metal doors with mortise or drive-in latches. From the Manufacturer --------------------- This lock and door reinforcer assists in preventing forced entry. It is easy to install and accommodates key-in-knob lockets or deadbolts. This reinforcer is used on wood or metal doors with mortise or drive-in latches.