Socket Set Screw, Head Type Square, Point Type Cup, System of Measurement Inch, Thread Size 5/16 In.-18, Overall Length 2 1/2 in, Drive Type External Square, Drive Size 5/16 in, Material Steel, Finish Plain, Pack Size Small Pack, Decimal Equivalent 0.312 in, Dimensional Standards ASME B18.6.2, Head Height 0.234 in, Head Width 5/16 in, Package Quantity 50