aluminium shell zinc inside cylinder lock 1 material: brass, AL, iron, zinc ... 2 different surface finished 3 60mm,70mm aluminium shell zinc inside cylinder lock Material: Brass, Zinc Alloy, Iron, Al, ... hardened ) Key : iron key or brass key ( 3pcs /set , 5pcs /set ) Lock core: brass or zinc Sealed bead: brass and iron ... copperHPhalf picks cylinder OCoval cylinder aluminium shell zinc inside cylinder lock