Cylindrical Knob Lock 1,Material:iron,brass,zinc alloy 2,Finish:AC 3,Backset:60 or70mm 4,Door thiickness:25-120mm ... Cylindrical Knob Lock Advantages: A) Variety types for selection ... quality & fashion trends design hardware such as zinc alloy door handles, door lock handles, door knobs, furniture handles & knobs, decorative hardwares and so ...