Nut Driver Set, Cushion Grip, 4-Piece Klein Tools 633 Full hollow shafts make it possible to work on stacked circuit boards or other long bolt applications Set contains 630-1/4, 630-5/16, 630-3/8 and 630-9/16 nut drivers Tip-Ident quickly identifies nut driver hex orientation and size by color coding the handle ends so you can easily engage the nut driver with the fastener Shafts are chrome-plated for smooth feel and corrosion resistance Internal flanges provide solid, twist-resistant shaft anchor Cushion-Grip handles for superior torque and comfort