DeWalt Extreme Impact Torsion bits withstand the high speed and torque of Impact Drivers, so your bit can keep up with you, even under pressure. DeWalt Extreme Impact Torsion Pozi Bits have a 15 torsion zone that allows the screw driver bit to flex rather than break, and the full fit head prevents rounding of the screw head and prevents '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. This set includes x9 25mm Extreme Impact Torsion bits in a plastic bit strip and a magnetic 1/4" bit holder with a pivoting head allowing you to get into those tougher positions a standard bit holder can't help with.