The Schlage Single Cylinder Deadbolt features a strong, all-metal chassis to protect against attacks executed by kick-in, lock pick, crowbar, saw, wrench or hammer. Intended for use on exterior doors where firm resistance is needed, this deadbolt operates with a key on the outside and a thumb turn on the inside. It is designed to fit existing pre-drilled holes on most standard doors and includes an assortment of strike plates to match your door's recess.