... ,tapping,punching, CNC machining, Anodizing(natural color,silver,black,gold etc.), powder coating,brushing,burring are available.3.Surface treatment:Anodized,Sand ... machining, polishing,etc.)6,Surface treatment (wire drawing, deburring, anodizing, powder coating, baking varnish,silkprint.) 7,Packing. Aluminium shell,Electric energy ...