... .eco-friendly 3.size: 20x20.1mm 4.DIN JIS copper sleeve Specifications:1) Suitable for various automotive, electronic, ... Mitutoyo fineness instruments for inspection, EDM, high speed CNC machine, Sodick wire EDM, etc. 3)Quality control equipments: roundness ... , others optional can be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, ...