Self Drilling Screw Finish Climaseal Material Steel Head Type Hex Washer Drive External Hex Screw Size 1/4 in Fastener Length 7/8 in Drill Point Size 1 Drill Tip Length 17/64 in Maximum Drilling Thickness 0.095 in Head Width 0.313 in Head Height 0.19 in Washer Outside Diameter 0.415 in Drive Size 5/16 in Pack Size Small System of Measurement Inch Maximum Head Width 0.313 in Minimum Head Width 0.313 in