Tip: T-20 Tamperproof TorxOverall Length: 1"Shank: 1/4" HexMade From The Highest Quality S-2 Tool SteelFor 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