Through-handle, full-hollow shaft for torquing hex nuts onto threaded rod of any length Color coding for easy identification of different sizes Wrench assist for additional torque Rare-earth magnetic tip holds nut in place while fastening Heavy duty handles and shafts exceed the torque performance of regular nut drivers Includes 1/4'', 5/16'', 3/8'', 7/16'', 1/2'' and 9/16'' hex sizes