U31810.025.0125 Self Drilling Tapping Screw, Finish Zinc Plated, 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 25/64 in, Maximum Drilling Thickness 0.219 in, Head Width 0.375 in, Head Height 0.19 in, Washer Outside Diameter 0.52 in, Drive Size 3/8 in, Pack Size Small, System of Measurement Inch, Maximum Head Width 0.375 in, Minimum Head Width 0.367 in, Maximum Head Height 0.19 in, Minimum Head Height 0.172 in