The dewalt dt70547t aluminium magnetic screwlock sleeve has been precisely cnc with a torsion zone to absorb peaks in torque this allows optimum bit flex for maximum life in impacthigh torque applications it has a specially designed bit tip which optimises the fit into the fastener and eliminates wobble and stripped screws preferred by professional users for excellent hold reach stability and accessibility in all screwdriving applications even the most awkward to reach the aluminium screw lock s