Hex Head Lag Screw, Material Steel, Finish Zinc Plated, Screw Size 3/4 In., Fastener Length 4 in, Threads per Inch 4.5, Thread Style Partially Threaded, Minimum Thread Length 2 49/64 in, Dimensional Standards ASME B18.2.1, Pack Size Small, System of Measurement Inch, Drive External Hex, Drive Size 1 1/8 in, Head Height 0.5 in, Head Style Hex, Head Width 0.768 in, Package Quantity 20