Nut Driver, Color Code Magnetic Nut Driver Set, 1/4 and 5/16-Inch Magnetic Tips Klein Tools 646M General purpose selection of the most frequently used nut drivers Includes two nut drivers (Cat. No. 646-1/4M and 646-5/16M) Full-hollow shaft design with Rare Earth magnetic tip facilitates work on bolt applications Handle end is color-coded for easy identification Internal flanges provide solid, twist-resistant shank anchor