GU Old Style Replacement uPVC Gear Box Door Lock Centre Case 30mm / 28mm Backset
Backset: 30mm. Case Width: Backset + 19mm. The follower is 8mm with the surround being thicker on the 30mm and thinner on the 35/45mm. Main Gearbox: Latch & deadbolt. GU gearboxes are fixed to their faceplates with 3 screws.