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 Cylinder is finished in Polished Brass The lock is covered by a 2 Year Guarantee and has a standard Security Rating