Coiled Spring Pin / Roll Pin / Spiral PinISO 8750 / DIN 7343Standard sizes.Material: Spring steel Mn65 / C67S.Stainless Steel ANSI 304 / A2, 316 / A4.Surface Finish: Black Oxide, Phosphating, Zinc plating, Dacromet, Plain. Size, thickness, style or other specifications can be designed according to your demand.