Hitachi 321823 1/4-Inch Hex Drive 3/8-Inch Keyed Chuck Adapter with Key Has a 1/4-inch drive Made with strong metal 1/16-inch to 3/8-inch capacity 3/8-inch to 24-Thread Comes with a 30-day limited warranty Hitachi 1/4-Inch hex drive 3/8-Inch 3-jaws drill chuck with key Provides quick change Guards against energy loss No weak points Ships at 8.8-Ounces