Self Drilling Screw Finish Plain Material 410 Stainless Steel Head Type Hex Washer Drive External Hex Screw Size 1/4 in Fastener Length 1 1/4 in Drill Point Size 3 Drill Tip Length 5/16 in Head Width 0.25 in Head Height 0.181 in Washer Outside Diameter 0.52 in Drive Size 3/8 in Pack Size Small System of Measurement Inch Application For Attaching Variety of Materials to Metal Up to 8 Gauge Head Color Silver Package Quantity 25