... drawings or samples.3).Materials: Stainless steel ,cold work steel ,spring steel ,aluminum alloy,brass, bronze,copper, plastic ,according to ... for Precision cnc milling part : GENERAL TOLERANCE (±mm)CNC Milling0.005CNC Turning0.005Grinding0.002ID/OD Grinding 0.002Wire-Cutting 0.002 High quality ... aluminum CNC machining precision parts