The Klein Tools 647M 7 Piece Magnetic Tip Nut Driver Set, 6 in. Hollow Shafts features nut drivers with internal flanges to provide a solid, twist-resistant shaft anchor. The Klein Tools 647M also features nut drivers that are made with chrome-plated, hollow shafts to help prevent corrosion. The donut-shaped magnetic tips on this unit easily hold fasteners in place for convenient use. The drivers are constructed with Cushion-Grip handles to provide greater torque and comfortable use.