The 40-Pc. Torsion Bit Set includes an Impact GOLD® Torsion Bit Holder and a range of bits with Xtreme Torsion Technology, which allows the torsion section of the bit and bit holder to flex under load and take pressure off of the bit tip for increased durability in high torque applications. The two-piece design is engineered to allow the torsion technology to fully activate. The insert bit holder features a rare earth Neodymium magnet, which is two-times stronger than magnets in standard insert bit holders so users get the added convenience of one-handed fastening. When used with an impact driver, the Makita Impact GOLD® Torsion Bit Set is ideal for a wide variety of fastening applications including deck building, framing, installing plywood subfloor, and more.