Irwin Impact Performance Series Impact Insert Bits are engineered for maximum durability and long life with impact drivers. This 8-Piece Multi-Pack contains a variety of commonly sized bits. These Insert Bits are designed with precision tip geometry so they fit fasteners more precisely, which reduces stripping and cam-out. Manufactured with heavy-duty high-grade steel, they'll withstand extremely high torque output. The black oxide finish resists corrosion and increases the life of the bit.