nuts 1.Material:stainless steel,steel 2.ISO,SGS certification 3.standard: din 934 4.over ten years ... your requirement is okStandardGB,GB/T,DIN,JIS,BSW,ANSI,ISO & non-standard productsSurfacePlain, Yellow zinc, black phosphated, grey phosphated, nickel ... fax:86-769-86734870 all kinds of Nuts (DIN/ANSI standards) in hardware manufacturer