A mortice lock is a type of lock that is fitted into a recess or pocket cut into the edge of a door. It is more secure and durable than a surface-mounted lock, as it is harder to tamper with or break. Mortice locks can have different features, such as a latch, a bolt, a cylinder, a handle, or a knob. They can also have different levels of security, depending on the number and shape of the levers or pins inside the lock mechanisum. mortice lock 1 side key 1 side knob