1.Material:Brass 2.Size:customized,per drawing 3.Roughness:Ra0.8 4.Tolerance: +/-0.02mm 5.Precision brass cnc ... GradeGB,ASTM,AISI,DIN,BS,JISProcessPrecision cnc turningTolerance:0.01mmSurface Roughness Ra0.8-3.2SoftwarePro/E,Auto CAD,Solid work,UG ...