Socket Set Screw Head Type Headless Point Type Knurled Cup System of Measurement Inch Thread Size 1/4 In.-20 Overall Length 1/2 in Drive Type Socket Drive Size 1/8 in Material Alloy Steel Finish Black Oxide Pack Size Small Pack Decimal Equivalent 0.25 in Dimensional Standards ASME B18.3 Head Height Not Applicable Head Width - Maximum Head Height Not Applicable Minimum Head Height Not Applicable Package Quantity 100