Tamper Resistant Screw Head Type Button Material 18-8 Stainless Steel Finish Plain Drive Torx 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 B18.6.3 Pack Size Small Type Tamper Resistant Screw Maximum Head Height 0.132 in Minimum Head Height 0.122 in System of Measurement Inch Thread Type Coarse Package Quantity 10