1.ISO9001:2008 2.Material:spring steel, alloy steel, stainless steel 3.Wire diameter:0.4mm~80mm 4.OEM and Customized We are Manufacturers, Exporters, Designers and OEM Suppliers of all types of Spring. Material55CrSi,60Si2Mn,60Si2MnA,60Si2CrA,60Si2CrVA,etcWire Diameter0.4mm~80mmFree Hight10mm~1188mmHardness42HRC~52HRCDirection of CoilsRight,LeftTotal CoilsAs per Drawing / Data.Load Bearing ...