Tip: T-40 Tamperproof TorxOverall Length: 2"Shank: 1/4" HexFully Hardened And Tempered For Long Life Under Constant UseFor Use With Hand Drivers And/Or Power ToolsDesigned To Withstand The High Torque Of Impact DriversTamperproof Style Tip Has Hole In Center To Accommodate Post In Head Of Tamper-Resistant Security ScrewsCan Be Used To Install Or Remove Tamperproof-Torx Drive Security Screws