- The DEWALT DT70512T Impact Torsion Screwdriver Bit Set contains a selection of high performance impact torsion bits that have been designed for use with impact drivers. - Preferred by professional users for maximum hold, tight access and no run out. - The CNC precisely machined bits have a torsion zone that absorbs peaks in torque allowing optimum bit flex for maximum life in tough Impact or High Torque industrial applications. - The bit holder features a magnetic screw lock system that is 10x stronger than the average holder, with an aluminium screw lock sleeve for use with torsion bits 50mm and above. - Plus an 85mm bit tip holder with removable sleeve for use with 25mm bits and a compact rapid load for use with bits 25mm and above. - Both.