The ERA Entrance Lock Door Knob Set Satin Chrome has a style widely used in America and some parts of Europe - the American style passage knob set is not so common here in the UK. All doors must be prepared with a 51mm diameter hole at 70mm from the door edge to use this door knob set. Supplied with Latch The knob set has a satin chrome finish. Each set comes complete with a 70mm backset mortice latch, all necessary fittings and full fitting instructions. Entrance Lock Set This set has an entrance locking function - this has a centrally located locking turn and is unlocked ...