GU uPVC Door Lock Gearbox. Old Style GU Centre Case. 28/30mm Backset
GU uPVC Door Lock Gearbox. Old Style GU Centre Case. 28/30mm Backset. GU old style locks are only available in 30 & 35mm backset. If you have 45mm or 55mm you will need to replace with a new style GU full door lock.