Pack of 5 DEWALT Extreme Impact Torsion Bits PZ3 50mm The DEWALT Extreme Impact Torsion Pozidriv Bits have a 15 torsion zone that allows the screwdriver bit to flex rather than break, and the full fit head prevents rounding of the screw head and 'cam out' (bit head slipping out of the screw head due to the turning force). The magnetic screw lock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws.