The DEWALT Extreme Impact Torsion Pozi 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 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. Tic Tac Box of 15 DEWALT Extreme Impact Torsion Bits PZ2 + Holder