The dewalt impact torsion screwdriving set features cnc precisely machined bits with a torsion zone to absorb peaks in torque allows optimum bit flex for maximum life in impact high torque applications they have a longer life faster more accurate screw driving thanks to a specially designed bit tip which optimises the fit into the fastener eliminates wobble and stripped screws preferred by professional users for maximum hold tight access and no run out supplied in a magnetic tough case contains