Union 77.5mm Bathroom Mortice Lock Satin Chrome (Stronger Sprung)
Overall length (from face plate to back of lock) is 77.5mm. Backset (from face plate to centre of spindle hole) is 57mm. Face plate measures 25.5x152.5mm. Receiver plate measures 25.5x140mm. Lock centres (distance from centre of larger spindle hole to centre of smaller spindle hole) are 57mm.