... carbon spring steel, Alloy steel and etc. Finish: black oxide, zinc-plate Spiral Compression SpringWire Diameter: 0.1~ ... 12.0mmThe maximum line diameter achieve to 70mmMaterial: Stainless steel, carbon spring steel, Alloy steel and ... oxide, zinc-plated, chrome-plated, power coating, passivated and etc.OEM are welcomed.Application: stamping molds, valves, ...