... red copper, brass, bronze alloy are available.2. surface treatments are available: polishing, zinc plating, nickel plating, ... in sheet metal work with very low piece price 5. Providing samples with inportant dimensions and customizing inspection ... Bending, turning ,Welding, roll-in, surface treatment, and other General Fabrication ServiceC Surface TreatmentPowder coating, Zinc plating, hot-dip, ...