Jonard's Nut Drivers have a full length hollow shaft, making them a great tool to use on stacked circuit boards and long bolts/studs. Our Nut Drivers feature the following: Internal shaft flanges to prevent the handle from slipping Ergonomically designed handle with thermoplastic rubberized grip for greater comfort and torque End of the handle is marked to be easily identifiable while stored This product complies with ASME B107.110 and ANSI standards