Hex Head Lag Screw, Material Steel, Finish Zinc-Plated, Screw Size 1/4 in, Fastener Length 4 1/2 in, Threads per Inch 10, Thread Style Partially Threaded, Minimum Thread Length 3 1/2 in, Dimensional Standards ASME B 18.2. 1, Pack Size Small, System of Measurement Inch, Drive External Hex, Drive Size 7/16 in, Head Height 0.172 in, Head Style Hex, Head Width 0.26 in, Package Quantity 100