U-Drive Screw, Finish Zinc-Plated, Material Steel, Fastener Length 5/16 in, Head Width 0.359 in, Head Height 0.141 in, Head Type Round, Maximum Head Width 23/64 in, Minimum Head Width Not Applicable, Maximum Head Height 9/64 in, Minimum Head Height Not Applicable, System of Measurement Inch, Dimensional Standards ASME B18.6.3, ASME B18.6.4, Drive No Drive, Head Material Steel, Package Quantity 500