... Bolt A: SpecificationMaterial:stainless steel, aluminum,carbon steelSurface Finish:nickel plated,white zinc,black zinc,color zinc,black ... ,ANSI,ISO & non-standard productsSurfacePlain, Yellow zinc, black phosphated, grey phosphated, nickel platingQualityBe affordable but of ... ,Sandblast and Anodize,Chromate, Polish,Electro Painting,Black Anodize,Plain,Chrome plated,etc.Heat TreatmentTempering,Hardening ...