Klein Tools 647M Magnetic Nut Driver Set, 6-Inch Shafts, 7-Piece Full hollow shafts (except 3/16-Inch [5 mm]) facilitate work on long bolt applications Rare Earth magnetic tips Cushion-Grip handles for greater torque and comfort Color coded handles domes for easy identification Internal flanges provide solid, twist-resistant shaft anchor Features a hollow shank allowing full engagement with nut to hold fasteners securely in place Suits for working on electrical and HVAC/R panels and stacked circuit boards Includes corrosion-resistant chrome-plated shafts and cushion-grip color-coded handles for torque, comfort, and hex size identification