Carriage Bolt, Inch, Neck Type Square, Basic Material Stainless Steel, Material Grade 18-8, Fastener Finish NL-19(SM), Dia./Thread Size 1/2 In.-13, Fastener Length 5 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Drill Size 17/32 in, Head Dia. 1.094 in, Head Height 17/64 in, Head Type Carriage, Square Height 0.250 in to 0.281 in, Square Width 0.515 in, Tensile Strength 100,000 psi, For Use With 18-8 Stainless Steel Nuts, Package Quantity 5