The design of the Cornwell 9 Piece Deep Well Bolt Extractor Set, No. VG3099001, allows it to fit over exposed studs and reach recessed fasteners. A reduced profile head enables use in confined spaces, and a 3/8” square drive allows use with hand ratchets, impact wrenches and air ratchets. Additionally, hexagonal flats permit use with a flat wrench, pliers, adjustable wrench, sockets or vise-grip locking pliers. Reverse spiral flutes are designed to bite down for gripping power, high-carbon steel ensures durability and the universal lobular design fits all types of fasteners.