Self Drilling Tapping Screw Finish Zinc Plated Material Steel Head Type Hex Washer Drive External Hex Screw Size #12 Fastener Length 2 in Drill Point Size 3 Drill Tip Length 23/64 in Maximum Drilling Thickness 0.187 in Head Width 0.312 in Head Height 0.312 in Washer Outside Diameter 0.432 in Drive Size 5/16 in Pack Size Small System of Measurement Inch Maximum Head Width 0.312 in Minimum Head Width 0.305 in Maximum Head Height 0.312 in Minimum Head Height 0.305 in