... Aluminum, Brass, Stainless Steel 2)Tolerance:+/-0.005mm 3)Finish: Polish, plating 4)Size:OEM 5)Sample: ... machine, drilling machine, tapping machine etc 2 ) Measuring & testing equipment: Projector , concentricity tester, hardness tester, roughness tester, torsion ... tester, tensile force tester,etc.3 ) Material: Different kinds of stainless steel, Brass , aluminum ...