42 Pc. Impact Driver & Bit Set Torsion flex design: The torsion flex design feature allows the torsion section to flex under load pressure to increase durability in torque applications. Magnetic strong lock drive system: The magnetic strong market drive system features powerful powerful magnetic insert bit holders designed for use with impact drills and drivers that reduces wobble and minimizes drops. BitPro insert bits are made of highest quality alloys featuring unique precision design that reduces stripping and extends bit life. Includes two magnetic bit holders, one with extendable drive guide sleeve. Heavy duty storage case featuring tilt out bit holders for easy access 16275