Irwin Tools 1866974 Power Bit Set, Square Drive, 5 Piece Forged rather than milled, to fit fasteners more precisely, reduce stripping, and increase bit life Forged from high-grade S2 steel. Black oxide finish resists corrosion and increases life of bit Compact bit holder keeps bits organized and secure, but is easy to carry in a pocket or pouch Longer bit works with deep impact drivers or power drill sockets