... mm 4.Spring in stainless steel and pins in brass Brass Door Lock Cylinder Material: Brass, Zinc Alloy, Iron, Al, etc.Length: 40- ... ) Key : iron key or brass key ( 3pcs /set , 5pcs /set ) Lock core: brass or zinc Sealed bead: brass and iron ( we can do ... (normal key)Computer key Door Lock Cylinder Surface finishing :Gold plated, chrome plated,nickel plated, polished brass,satin nickel, satin chrome, ...