1/4"-20 x 7/8" Hex - Slotted Indented Hex Washer Head Zinc Finish Type F Point Steel Thread Cutting Screw / FASTENER LENGTH: 0.875 INCHES NOMINAL HEAD STYLE: C7 HEXAGON EXTENDED WASHER HEAD HEIGHT: 0.302 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM EXTENDED WASHER DIAMETER: 0.48 INCHES MINIMUM AND 0.52 INCHES MAXIMUM EXTENDED WASHER THICKNESS: 0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM INTERNAL DRIVE STYLE: D14 SLOT NONMACHINE THREAD STYLE: A3 DOUBLE FLUTE (TYPE F) NONMACHINE NOMINAL THREAD DIAMETER: 0.25 INCHES MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL