The yale 706 nightlatch is a traditional style nightlatch 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 706 nightlatch has a 40mm backset this is the measurement from the edge of the door to the centre of the keyhole locks with a 40mm backset are normally used where there is restricted space such as on a narrow glass panelled door cas