1.Diameter:0.1~16mm 2.Grade:A,B,C 3.Steel Grade: carbon steel 60, 65,70, 85 4. Used in Auto indurstry,hardware industry,etc details of product description:1.We are specialized in producing spring steel wire rod and steel bar which used for making various kinds of spring, such as auto suspension spring, moto shock abosorbers, valve spring, extension spring, roller shutter doors, elevator,appliance ...