Metric Compression Springs 1,Products DetailesMaterial1.Stainless Steel: SS201, SS303, SS304, SS316, SS410, ... Anodize,Chromate, Polish,Electro Painting,Black Anodize,Plain,Chrome plated,Hot Deep Galvanize(H. D. G. ) etc.Heat TreatmentTempering,Hardening,Spheroidizing ...