... :M3-M52 2.Grade:A2-70,A4-70,carbon steel4.8-10.9,B7 3.DIN975,DIN976 or customizing 4.Certificate ... .Size:M3-M522.Grade:A2-70,A4-70,carbon steel4.8-10.9,B73.DIN975,DIN976 or customizing4.Certificate:ISO,SGSProductDIN975 ... rodMaterialStailess steel SS301, SS304 SS316 SS430,etc carbon steel 4.8-10.9Finishnickel plated, passivation,black oxide,self color,zinc platedSizeM3 ...