Designed specifically to remove lugnuts. When you are faced with a rounded-off, rusted-tight or painted-over bolt, bolt extractors will break it free. Reverse spiral flutes are designed to bite down to provide maximum gripping power. 3/8 in. square drive for use with hand ratchets, impact wrenches, and air ratchets. Universal lobular design fits all types of fasteners. Hexagonal flats for use with flat wrench, pliers, adjustable wrench, sockets or VISE-GRIP locking pliers. Set includes plastic case.