Operates any quantity of cylinders of different individual key changes.
An arrangement of cylinders having individual key changes, which permits them all to be operated by a single key called a master key.
A cavity made to receive a lock or other hardware also the act of making such a cavity.
A lock designed to be installed in a mortise rather than applied to the door’s surface.
A fixed or movable post dividing an opening vertically used with a pair of doors.