... to customers' drawings or samples.3).Materials: Stainless steel ,cold rolled steel ,spring steel ,aluminum alloy, brass, bronze, copper, ... ASTM,AISI,DIN,BS,JISProcessPrecision CNC machiningTolerance:0.005mmSurface Roughness Ra0.4-3.2SoftwarePro/E, AutoCAD ,Solid work, ... Milling0.005CNC Turning0.005Grinding0.002ID/OD Grinding 0.002Wire-Cutting 0.002 Machining part aluminum extrusion heatsink for cooling