A
strike plate is a
metal plate affixed to a
doorjamb with a hole or holes for the bolt of the
door. When the door is closed, the bolt extends into the hole in the strike plate and holds the door closed. The strike plate protects the jamb against friction from the bolt and increases security in the case of a jamb made of a softer material (such as
wood) than the strike plate. A plate on the
lockset itself (on the door, not the jamb) is instead called a
face plate.