1) With the largest wire diameter is 11.0mm 2) Different shapes of hooks available 3)ISO9001, 14001, TS16949, 13485 Product scopeCompression Spring, Extension spring, Torsion Spring,Coil spring, suspension spring, etc.MaterialCarbon spring steel, alloy spring steel, stainless steel, high temperature Resisting alloy, corrosion-resistant alloyWire dia1.5mm to 18mmProcessStamping, bending, welding, ...