P77 Traditional Nightlatch 60mm Backset Chrome Finish Box - Yale Locks 630077105542, The Yale 77 Series Traditional Nightlatches are the Original Yale Lock with classic styling. The deadlocking snib function enables the latch to be held back or deadlocked internally. The nightlatch is key operated from the outside and has a knob handle for operation from inside. The 77 Series Nightlatches have a 60mm backset, this is the measurement from the edge of the door to the centre of the keyhole. Supplied with 1109 external cylinder.This Yale P77BLX has a hardened case finished in Brasslux and the Cylinder is finished in Polished Brass Pack Type: Visi PackSupplied with 2 x keysSecurity Rating: StandardNot recommended for glass panelled doors, unless used in conjunction with a 5 lever mortice lock Yale Locks P77 Traditional Nightlatch 60mm Backset Brasslux Finish Visi