Hex Head Lag Screw, Material Steel, Finish Zinc Plated, Screw Size 3/8 In., Fastener Length 4 1/2 in, Threads per Inch 7, Thread Style Partially Threaded, Minimum Thread Length 2 3/4 in, Dimensional Standards ASME B18.2.1, Pack Size Small, System of Measurement Inch, Drive External Hex, Drive Size 9/16 in, Head Height 0.25 in, Head Style Hex, Head Width 0.388 in, Package Quantity 50