According to customer customized production and processing of various metal parts, the materials can be brass, aluminum, aluminum alloy, stainless steel (303.304.316), and other special materials. The surface electric bottom treatment can be selected with various colors of anodes such as nickel, chromium, gold, silver and copper. The appearance salt spray oxidation resistance test is 48h 72h..... At last, it can pass 200H without blackening and discoloration.