Tamper Resistant Screw Head Type Flat Material 18-8 Stainless Steel Finish Plain Drive Torx Thread Size 1/4 In.-20 Fastener Length 1 1/2 in Head Width 0.531 in Head Height 0.161 in Drive Size T27 Dimensional Standards ASME B18.6.3 Pack Size Small Type Tamper Resistant Screw Maximum Head Width 0.531 in Minimum Head Width 0.48 in System of Measurement Inch Thread Type Coarse Package Quantity 10