Mortise locks are robust and secure door locking mechanisms designed to fit into a specially cut recess or "mortise" in the edge of a door. These locks are commonly used in both residential and commercial settings, offering a high level of security and durability.
The design of a mortise lock typically includes a lock body that fits into the door's thickness, a strike plate that attaches to the door frame, and a system of levers or pins that engage with the lock cylinder. The cylinder, which houses the keyway, is turned by a key to operate the lock. Mortise locks often provide additional security features, such as deadbolts or hook bolts, making them a popular choice for external doors.