Hex nut 1.Standard :DIN, ANSI, BS, ISO GB 2.Size: M4~M90 3.Finish ;plain , Black, Zinc plate ,Hot dip galvanizing 4.Grade: from class 4.8 to class 12 5.Material : carbon steel With competitive prices , effectively avoid middle costs. We are the right supplier you should contact. The part hereof only shows our manufacturing capabilities , if you have any other requirements, please send us the drawing to us