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 socket engraved 1- 10 on for easy visibility. A must have tool for oil drain plug,oil pan bolts, exhaust manifold nuts, car, vehicle and engine etc. Specifications: Material: Chromium Vanadium Alloy Steel Remove No.: 1/2/3/4/5/6/7/8/9/10 Inside Size(Fit for removing Hex Size): 9/10/11/12/13/14/15/16/17/19mm Outside Hex Size: 16/16/19/19/19/22/22/25/25/27mm Item Weight: 240g/8.5oz Package Weight: 246g/8.7oz Package Size: 15*10*3cm/5.9*3.9*1.2in Package List: 10 * Nut Extractor 1 * Wrench