'Tamper Resistant Screw, Head Type Button, Case Hardened Steel, Length 3/4", Drive Type Torx, Finish Black Oxide, Thread Size 6-32, Driver Size T10, Head Dia. 0.250-0.262", Head Height 0.063-0.073", Meets/Exceeds ANSI/ASME B18.6.3, Package Quantity 25'