Inch, Step Bolt, Steel, Material Grade A307B, Fastener Finish Plain, Dia./Thread Size 3/8 In.-16, Fastener Length 1 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Industry Standards ASME B18.5, Head Dia. 1.219 in to 1.219 in, Head Height 13/64 in, Square Height 0.188 in to 0.219 in, Square Width 0.368 in to 0.388 in, Tensile Strength 60,000 psi, Package Quantity 400