Mul-t-lock Hercular Double Cylinder deadbolt - Bright Brass Hercular Heavy Duty Double Cylinder Deadbolt - Supplied in Polished Brass US3/05 Finish Each keyed different lock provided with 2 duplication restricted keys and control card. Interative+ Key System, Locks Supplied Keyed Different with 2 keys - Control Card Required for Duplicate Keys Extra keys available from an Authorize Mul-T-Lock Dealer Adjustable backset 2-3/8 or 2-3/4 , no need for different parts