This WARRIOR® Nut and Bolt Extractor Set is constructed with reverse spiral flutes to securely grip damaged or rounded nut or bolt heads for easy removal. The set includes the following sizes: SAE: 3/16 in., 1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in.; Metric: 8 mm, 10 mm, 11 mm.