Hex Head Lag Screws Material Steel Finish Hot Dipped Galvanized Screw Size 5/8 in Fastener Length 3 1/2 in Thread Style Partially Threaded Dimensional Standards ASME B18.2.1 Pack Size Small System of Measurement Inch Drive External Hex Drive Size 15/16 in Head Height 0.422 in Head Style Hex Head Width 0.642 in Package Quantity 25