The bolt can be locked inside the lock case. The deadlocking can be controlled by a sliding snib on the forend of the lock case. When the snib is in its up position, the lock deadlocks and can only be opened by a key or by the thumbturn. When the snib is in its down position, the bolt is locked inside the lock case. The lock case works with the 4690, 4691, LP711, LP714, LP721, and LP731 striker plates
Mortice standard: SFS 5209
