7-Piece Nut Driver Set Hollow shaft nut driver works well on long bolt applications Color-coded cushion grip handle offers great comfort and torque The Klein Tools, Inc. 7-Piece Nut Driver Set is designed to work well on stacked circuit boards and other long-bolt applications. Its 7 nut drivers are some of the most frequently used hex sizes. They are plated with corrosion-resistant chrome for strength and endurance. Their internal flanges provide twist-resistant shaft anchors for the full-hollow shafts, and their handles are color coded for easy identification.Includes 3/16, 1/4, 5/16, 11/32, 3/8, 7/16 and 1/2 in nut driversH