Self Drilling Screw Finish Climaseal Material 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 1/2 in Maximum Drilling Thickness 0.21 in Head Width 0.375 in Head Height 0.23 in Washer Outside Diameter 0.5 in Drive Size 3/8 in Pack Size Small System of Measurement Inch Maximum Head Width 0.375 in Minimum Head Width 0.375 in