Flanged Serrated Bolt Grade 5 Zinc Steel, Zinc FT, 10-32 x 3/8" Length, 100 Pcs Head Width Hex 5/16" Head Height 7/32" Thread Length: Full Flange Diameter: 29/64" Grade 5 Steel Length is measured from under the flange. Head Height includes the Flange SAE J429 ’s;