Self Drilling Screw, Head Type Hex, Finish Zinc Plated, Material Steel, Screw Size 1/4 In., Fastener Length 1 1/4 in, Head Width 0.375 in, Head Height 0.25 in, Dimensional Standards Not Applicable, For Maximum Material Thickness 1 1/4 in, Pack Size Small, Minimum Head Height 0.25 in, Minimum Head Width 0.375 in, Maximum Head Height 0.25 in, Maximum Head Width 0.375 in, System of Measurement Inch, Drive External Hex, Point Type BSD, Features Fastens E-Track to Structural Metal Surfaces