... SS-304, SS-302, Aluminum, Brass, Bronze, medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating, ... plated, blue black zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing etc.Applications ... AUTO lathe, springs, shafts, screws, stamping parts and other metal parts. Our main production modes are designing and proofing ...