This nut and bolt extractor set works with most cordless drills, impact drivers, corded drills and nut runners. A special internal design grabs hold of even stripped, rusted and painted fasteners for easy removal. The set includes the following sizes: 3/16 in., 1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in., 8mm, 10mm, 11mm.