Ashland sliding door single point mortise lock, 45mm backset. This lock uses a hook, the center hook goes into the lock case and pushes the plate back. This allows the thumb turn or key to turn and secure door in locked position.
Faceplate Width: 25/32 inch.
Backset: 1-3/4 inch.
Faceplate Length: 10-1/2 inch.
Screw Hole: 5-5/8 inch.
***Special order, allow around 2 to 3 weeks to ship.