Thread Cutting Screw Finish Zinc Plated Material Steel Head Style Hex Washer Drive Slotted Thread Size 5/16 In.-18 Fastener Length 1 in Head Type Hex Washer Head and Washer Height 0.222 in Dimensional Standards ASME B18.6.4 System of Measurement Inch Head Height 0.222 in Head Width 0.5 in Package Quantity 100