Tip: 3/16" Tamperproof HexOverall Length: 1"Shank: 1/4" HexTamperproof Style Tip Has Hole In Center To Accommodate Post In Head Of Tamper-Resistant Security ScrewsMade From The Highest Quality S-2 Tool SteelFor Use With Hand Drivers And/Or Power ToolsDesigned To Withstand The High Torque Of Impact DriversCan Be Used To Install Or Remove ScrewsCan Be Used On Security And Non-Security Screws