Car springs, Wire Spring ,Torsion Spring ISO9001:2008 Manufacture CNC spring machine 1.Certification:ISO9001:20082.Application:cars,electonic and ... ,iorn,copper,manganese,etc.4.Surface Treatment:zinc plating,nickel plating,chromium plating,and other related metal materials.5.Making Process ... ,Burnishing,Slab Milling,Face Milling and End Milling.6.Wire Diameter Range:0.05mm-10mm7.We are specialized in ...