stamping part DIN ANSI JIS ASTM M3-M48 1/4"-3" Product ... GALVANIZED,Cr Cu or Ni PlatedMaterialCarbon Steel,Brass, Stainless steel,Spring steelMaterial Class4.8 6.0 8.8 12.9gradeProduct sizeM3 ... about our company:1, Our packing: 2, Our warehouse: stamping part