Carriage Bolt, Inch, Neck Type Square, Basic Material Steel, Material Grade Grade A, Fastener Finish Zinc Plated, Dia./Thread Size 7/16 In.-14, Fastener Length 4 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), ASME B18.5, Drill Size 7/16 in, Head Dia. 0.907 in to 0.969 in, Head Height 15/64 in, Head Type Round, Square Height 0.219 in to 0.250 in, Square Width 0.431 in to 0.452 in, Tensile Strength 74,000 psi, For Use With Grade 2 Zinc Nuts, Package Quantity 120