cnc machine part 1.machine screw size,M3-M36 2.carbon, stainless steel 3.zinc plated,black,etc 4.flat,pan, etc. cnc machined aluminum parts 1.Surface Finish: annealing, natural anodization, heat treatment, polishing, nickel plating, chrome plating, yellow passivation, gold passivation, galvanizing, satin, etc.2.Processing Method: cnc machining, turning, milling, drilling, grinding, broaching, ...