These DeWalt Extreme Impact Torsion Pozidriv Bits have a 15° torsion zone that allows the screwdriver bit to flex rather than break. The full fit head also prevents rounding of the screw head and 'cam out', which is when the bit head slips out of the screw head due to the turning force - while the magnetic screw lock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws.