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 impact/high 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 sleeve is for use with 50mm + torsion bits.