Heavy duty nut driver set. It has through-handle, full-hollow shaft for torquing hex nuts onto threaded rod of any length. It has color coding for easy identification of different sizes. Its wrench-assist for additional torque. Its rare-earth magnetic tip holds nut in place while fastening. It has heavy duty handles and shafts exceed the torque performance of regular nut drivers. It includes 1/4, 5/16, 3/8, 7/16, 1/2 and 9/16 inch hex sizes.