Hitachi 985330 1/4-Inch Hex Drive to 3/8-Inch M10 Magnetic Hex Socket, Black Oxide 1/4-Inch hex drive to 1/4-Inch hex socket Adds versatility to your power drills Coated in a black oxide finish, this quick-change hex socket is ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Hitachi offers the best durability and speed for general purpose drilling applications Comes with a 30-day limited warranty