... are made of black metal, nonferrous metal, iron-copper materials, aluminum alloys and stainless steel. Our products ... Strict quality control system Material Steel,stainless steel, aluminum, zinc, copper, brass etc Machining process CNC machining, turning, milling, ... planning, welding, laser cutting Surface treatment Polishing, chrome/zinc/nickel plating, power coating, anodize, E-coating Applicable ...