Automatic Yale Deadlatch No.1 Brasslux
The centre of the keyhole must be 60mm from the edge of the door, and the overall width of the lock body to be fitted to the inside of the door is 92mm. Key lockable lever handle operation from inside. The latchbolt automatically deadlocks on closing the door. This lock should preferably be used in conjunction with a British Standard mortice lock (BS3621).