... .0 ISO9001:2008 ; tolerance: +/-0.0001mm Little Moudle Worm Gear with metal Specifications:1) Suitable for various automotive, electronic, telecommunications, mechanical products ... optional can be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, others optional7) Products ...