stainless security door viewer 1.very good quality with lower price 2.We delivery ... parts with differentmaterials, such as brass, aluminium, steel, stainless steel, zinc. Our strong R&D and QC department can control the ... : stainless steel, copper, steel, aluminum alloy, zinc alloy,etcDifferent kinds of finish available, like polishing, zinc plating, nickelplating or chrome plating,phosphating ...