Irwin Tools 59909 Impact Performance Series Bolt-Grip Extractors Deep Well, 9/16" x 3/8" IMPACT Performance Series Bolt Grip Deep Well Bolt Extractors Built for maximum durability and long life with impact drivers Engineered with patented reverse spiral flutes to fit over exposed studs and easily grip recessed fasteners including broken nuts, bolts and screws High carbon steel ensures longer life and greater durability Universal lobular design fits all types of fasteners