Carriage Bolt Square Neck Round Head Low Carbon Steel Heat Dipped Galvanized Size 1/4-20 Length 5 1/2 In Head Diameter 0.563 In Head Height 0.125 In Square Width 0.245 In Square Height 0.125 In Drill Size 17/64 In Tensile Strength 60 000 For Use With Grade A Galvanized Nuts Grade A Package 100