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A Mortise lock set is a type of lock that consists of a lock body that fits into a pocket (or mortise) cut into the edge of a door, and a box keep that fits into the door frame. A mortise lock set also includes a cylinder, a spindle, and handles or knobs that operate the lock. A mortise lock set can provide high security and durability for doors that need to withstand heavy use. There are different types of mortise lock sets depending on the function, style, and security level.