Circlip / Retaining Ring DIN471 / DIN472 / DIN6799 / DIN983 / DIN984 / Crescent Ring M1800Size: 3mm~500mm.Material: Carbon spring steel Mn65 / C67S.Stainless Steel ANSI 420, 304.Surface Finish: Black Phosphating, Black Oxide, Zinc Plating.Size, thickness or other specifications can be designed according to your demand.They're widely used for Axletree fitting, Auto parts, Pump field, Tractor, power transmission products and so on.