Features: High Quality — Damaged nut and bolt extractors set made from high-strength chromium-vanadium alloy steel with black oxide finished to withstand corrosion, providing superior strength for greater turning power and durability. High Performance — The upgraded spiral flute cutting edge profile for a secure connection, provides a reverse grip for maximum power. 2 Way Operation — The extractor socket has two ways of driving it, a 3/8 square from the center and a hexagon from the outside. Hexagonal flats used in conjunction with sockets, pliers,flat wrench,and vise-grip locking pliers etc, while 3/8-Inch square drive accommodates with regular 3/8 ratchet or extension. Full Equiped — Total 10 metric standard sizes sockets including 9/10/11/12/13/14/15/16/17/19mm. Extremely effective for removing rusted, stubborn nuts, and even rounded or stripped studs especially oil drain plug. An extension included to remove the damaged fastener from the socket. Convenient Select — Each