... ),Grinding machines(including Internal,External and Centerless grinding machine),Wire cutting machines,and other Precision CNC machining machines.2). ... 3).Materials: Stainless steel ,cold work steel ,spring steel ,aluminum alloy,brass, bronze,copper, plastic ,according to customer request4).Finish: ... .002ID/OD Grinding 0.002Wire-Cutting 0.002 High quality aluminum CNC machining precision parts