Self Drilling Screw Finish Climaseal Material Steel Head Type Hex Washer Drive External Hex Screw Size 1/4 in Fastener Length 4 in Drill Point Size 5 Drill Tip Length 27/32 in Maximum Drilling Thickness 0.5 in Head Width 0.313 in Head Height 0.18 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