Machine Screw Head Type Flat Material Steel Finish Zinc Plated Drive Torx Thread Size 1/4 In.-20 Fastener Length 3/4 in Head Width 0.507 in Head Height 0.153 in Drive Size T27 Dimensional Standards ASME B18.6.3 Pack Size Small Type Standard Machine Screw Washer Thickness - System of Measurement Inch Thread Type Coarse Package Quantity 100