The yale 82 deadbolt nightlatch front door lock has a deadbolt operation only with no intermediate latching action and it is opened by a key from the outside and a turn handle operation from inside the 82 deadbolt nightlatch has a 60mm 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 this yale 82dmgpb has a hardened case finish in dark metallic grey and the