... any spot on the surface Product No./NameJJ-00202 / CNC turning part for electrode bar Machining Capability1) Material: Aluminum, Aluminum alloy ... powder coating, anodize and polishing3) Provide machining service: CNC machining, turning, milling, tapping, drilling, polishing, punching, etc... 4) Tolerance: +/-0. ... ) Tolerance: +/- 0.0005 inch, also accord with GB6414 CNC turning part for electrode bar