... , sheet metal, extrusion, casting and assembly.2.Various Machining Materials:Stainless steel, Carbon steel, Alloy steel, Brass, Bronze, Copper, Aluminum, Plastic ... , or customer specified. 3.Finish: Anodizing, Conversion Coating, Nickel plating, Zinc Plating, Chemical Polishing, Electric Polishing, Mechanical Polishing, Powder Coating, Painting ...