The Klein Tools 6-Piece Hollow Magnetic Color-Coded Ratcheting Power Nut Drivers (32950) set includes six hex sizes: 1/4", 5/16", 3/8", 7/16", 1/2", and 9/16". Each driver features a 3 3/4" hollow core for working on threaded rods and a 5" durable shaft for extended reach. Equipped with powerful Rare-Earth magnets that increase in size with each hex, these drivers securely hold fasteners for efficient one-handed operation. The ratcheting cushion-grip handle ensures superior comfort and control, while color coding allows quick size identification. Constructed from high-grade impact steel with a corrosion-resistant finish, this set is built for professional use.