... 20x20.1mm 4.DIN JIS copper sleeve Specifications:1) Suitable for various automotive, electronic, telecommunications, mechanical products, medical devices, etc ... , others optional can be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel ... High-precise Stainless Steel products, Pins made of Iron, Copper and Aluminum, and so on, with an output of ...