Klein Tools 7-Piece Cushion-Grip Nut Driver Set contains the type of nut drivers professionals carry most often. Each nut driver features a full hollow shaft for work on stacked circuit boards or other long bolt applications. Klein's patented Cushion-Grip handle provides greater torque and comfort.PRODUCT FEATURES:- General-purpose selection of the most frequently used nut drivers - 6-Inch (152 mm) full hollow shaft facilitates work on long bolt applications - Set contains Klein Catalog Nos. 646-3/16, 646-1/4, 646-5/16, 646-11/32, 646-3/8, 646-7/16 and 630-1/2 nut drivers - Cushion Grip handles allow for greater torque and comfort - Shafts are chrome-plated for smooth feel and corrosion resistance - Internal flanges provide solid, twist-resistant shaft anchor