Mortise Locks

A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket—the mortise—to be cut into the edge of the door into which the lock is to be fitted. In most parts of the world, mortise locks are found on older buildings constructed before the advent of bored cylindrical locks, but today they have become more common in commercial and upmarket residential construction in the United States. The design standard on most apartment entry doors.