1.D ring 2.Wire dia: 0.08-14mm 3.Material:many ... products is wide, including Compression springs, Extension springs, Torsion springs, Battery spring, Power spring, Coil spring , Leaf spring, Mould spring,etc ... :0.15-8mm12Material:carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc13Casting experience:More than 20 years14Strong ...