... is wide, including Compression springs, Extension springs, Torsion springs, Battery spring, Power spring, Coil spring , Leaf spring, Mould spring ... /Pieces per Day discussable11Wire diameter range:0.15-8mm12Material:carbon steel,stainless steel, manganese steel wire, nickel wire, ... qualitly products15Finish :Powder coating,neikel plating,chrome plating,zinc plating,etc and We can make according to your ...