Tapping Sheet Metal Screw, Head Type Flat, Finish Zinc Plated, Material Steel, Screw Size #4, Fastener Length 1/4 in, Head Width 0.212 in, Head Height 0.047 in, Drive Size #1, Dimensional Standards ASME B18.6.3, For Maximum Material Thickness 3/64 in, Pack Size Small, Minimum Head Height 0.038 in, Minimum Head Width 0.191 in, Maximum Head Height 0.067 in, Maximum Head Width 0.212 in, System of Measurement Inch, Drive Phillips, Point Type AB