... Day discussable11Wire diameter range:0.15-8mm12Material:carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc13Casting ... from Germany,vacuum melting furnace,CNC machine center17Production euipment:devise industrial,auto, motorcycle, electronics, machinery, sports goods, equipment, ... (5) Number of coils(6) Qty Galvanized Steel compression spring for industrial use