Chrome vanadium steel. Converts drill and drill driver to nut driver. Magnet for secure grip of fixing. Drives hex nuts and hex head bolts, screws and fixings. 1/4″ hex shank. Chrome vanadium steel. Converts drill and drill driver to nut driver. Magnet for secure grip of fixing. Drives hex nuts and hex head bolts, screws and fixings. 1/4″ hex shank.