burglarproof lock cylinder with conputer key burglarproof lock cylinder with conputer keyMaterial: Brass, Zinc Alloy, Iron ... : sintered steel ( very hardened ) Key : iron key or brass key 3pcs /set , 5pcs /set Lock core: brass or zinc Sealed bead: ... oval button ans so on. key type:S-groove key (normal key)Computer keyburglarproof lock cylinder,lock core,cylinder lock--- Surface finishing :Gold plated, ...