Self-Drilling Screw, Finish Zinc-Plated, Material Steel, Head Type Hex Washer, Drive External Hex, Screw Size 1/4 in, Fastener Length 1 in, Drill Point Size 3, Drill Tip Length 5/16 in, Head Width 0.366 in, Head Height 0.253 in, Washer Outside Diameter 0.476 in, Drive Size 3/8 in, Pack Size Bulk, System of Measurement Inch, Maximum Head Width 23/64 in, Minimum Head Width Not Applicable, Maximum Head Height 1/4 in, Minimum Head Height Not Applicable, Application Steel and Steel Studs