... plating, the wreath oxygen resin spraying, the heat disposing, hot-dip galvanizing, black oxide coating, painting, powdering, color zinc ... features: A company with industry and trade integration6Main Products: Compression spring, Extension spring, Torsion spring ,Coil spring etc7 ... 2000, specializing in the production of CNC/AUTO lathe, springs, shafts, screws, stamping parts and other metal parts. ...