The Bosch 47-Piece High-carbon Steel Hex Shank Screwdriver Bit Set features insert bits, power bits and more for all-in-one convenience. This set provides accessories for applications in wood, metal and masonry. These bits are designed for today's tough-torque applications. Made from the high-quality tool steel, the bits are fully hardened. Their jobsite-proven tempering process gives these bits increased durability. This helps to ensure long life under constant demanding use. They are engineered with precision-formed tips for proper fit.