... , copper-plating, the wreath oxygen resin spraying, the heat disposing, hot-dip galvanizing, black oxide coating, painting, powdering, color zinc-plated, blue ... in the production of CNC/AUTO lathe, springs, shafts, screws, stamping parts and other metal parts. Our main production modes are designing and proofing ... : http://gdsx.en.alibaba.com Brass/SUS/Aluminum union and pipe and bushing in guangdong