... 3)Finish:Polishing , plating 4)Color:gray,white,black lamp part 1)Material: zinc alloy2)Tolerance: +/- 0.005mm 3)Finish:Polishing ... . 1)Main production equipment: CNC turning and milling machine, automatic lathe machine, thread rolling machine, drilling machine, tapping machine, etc 2 ) Measuring & testing equipment: Projector , concentricity ...