heavy Hex Bolts 1.Standard:DIN931/933, ASTM,JIS,BS, 2.Size:M3-M72 3.Grade:4.8/6.8/8.8/10.9/12.9 4.Finish:ZP,HDG, black hex structure boltDescriptionTypeBoltMaterialCarbon Steel, Alloy Steel, Stainless SteelStandardDIN931/933 DIN912, ASTM,JIS,BS, etcSizeM3-M72GradeGR. 4.8/6.8/8.8/10.9/12.9FinishBlack, Zinc Plated, Galvanized, Hot Dip Galvanized, Nickel Plated, Chrome PlatedMarkingstandard or as ...