... . CNC machining products could be made from drawing pipes, bar stock, forging parts, casting parts, extrusion parts etc.3. Main ... , such as anodizing, zinc plating, chorme plating, nickel plating, passivating,powder coating, painting and so on.6. Tolerance for profile dimension +/-0 ... prevent products from rusting without using any oil. 6061-T6 aluminum CNC machining stand-off with 5/8" depth