WHOLESALE 9PC 1/4'' NUT & BOLT EXTRACTOR SET. This nut and bolt extractor set works with most cordless drills, impact drivers, corded drills and nut runners. Made of Chrome Moly Steel. A special internal design grabs hold of even stripped, rusted, and painted fasteners for easy removal. The set includes the follwing sizes: 3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 8mm, 10mm, 11mm. Reverse spiral flutes are designed to bite down to provide maximum gripping power. Works with most quick-change adapters. 1/4'' hex quick connect shank. Universal design fits virtually all types of fasteners.Illinois Industrial Tools