Neiko 10066A Magnetic Power Nut Setters, 5 Piece SAE (1/4" - 1/2") Set | Chrome Vanadium Steel | 1/4" Hex Shank Powerful magnet that lets you avoid holding onto hard to reach bolts with the strong magnetic feature that holds bolts in place while you drive The nut setters are constructed of chrome vanadium steel for extra durability and strength 1/4" hex shaped design shank allows you to quickly change between sizes and ensures a grip onto the chuck Each piece is laser etched with the (SAE) measurement for easy identification while working The set includes hard to find larger nut setter sizes ranging from: 1/4", 5/16", 7/16"/ and 1/2" that have lengths of 2-9/16" (65M/ML); perfect for drills and drivers