Nut driver set, 7 piece, 6in shaft, sizes 3/16in, 1/4in, 5/16in, 11/32in, 3/8in, 7/16in & 1/2in - each nut driver in this 7-piece set features a full hollow shaft for work on stacked circuit boards or other long bolt applications. Klein's patented cushion-grip handle provides greater torque and comfort.