Tamper Resistant Screw, Head Type Button, Material Steel, Finish Black Oxide, Drive Tamper-Resistant Torx (R), Thread Size 1/4 In. -20, Fastener Length 1 1/2 in, Head Width 0.428 in, Head Height 0.132 in, Drive Size T27, Dimensional Standards ASME B 18.3, Pack Size Small, Minimum Thread Length Not Applicable, Type Machine Screw, Washer Outside Diameter Not Applicable, Washer Thickness Not Applicable, Maximum Head Width 27/64 in, Minimum Head Width Not Applicable, Maximum Head Height 1/8 in. This item has been restricted from sale in the following state (s): []