7 in 1 nut driver set, easy, 1 handed driving, sizes are interchangeable, color coded shaft ends make it easy to identify the size, strong, 1/4", 5/16", 11/32", 3/8" & 1/2" rare earth magnets, 7/16" & 9/16" spring coils holds nuts & bolts in place without the use of magnets, 1/4", 5/16", 3/8", 7/16" & 9/16" hollow shafts for driving nuts deep onto bolts or threaded rod, heavy duty handle & shaft exceed the torque performance of regular nut drivers, wrench assist on handle for added torque on tough jobs.