... also small order, and develop the products with excellent quality on the basis of Customers specific ... , Extension springs, Torsion springs, Battery spring, Power spring, Coil spring , Leaf spring, Mould spring,etc., and other unique feature products. ... 8mm12Material:carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc13Casting experience:More than 20 years14Strong ...