precision machine bolts 1. top precision 2. competitive price 3. cnc machining ... , copper, iron, brass, aluminum, zinc alloyProcessingCNC turning, milling, drilling, Automatic lathe machiningSurface finishChrome plating, zinc plating, blackening, Nickel plating, Electrophoresis, AnodizationColorMetal ... .We are looking forward to our Win-Win Cooperations!! precision machine bolts