The DEWALT Impact Torsion 2 x T25 50mm and Magnetic Screwlock Sleeve Set. The impact bits have a 15° torsion zone that allows the screw driver bit to flex rather than breaking and the Full Fit head prevents the rounding of the screw head and prevents 'cam out' (bit head slipping out of screw head due to the turning force). The Magnetic Screwlock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws.