... :2008 4. Tolerance:+/-0.0001 high quality stainless steel worm gear with good priceSpecifications:1 ... inspection, EDM, high speed CNC machine, Sodick wire EDM, etc. 3)Quality control equipments: roundness ... aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, others optional7) Products ... various kinds of precision axis and plastic products.• Guoxiang obtained ISO9001:2000 ...