Usage Tips:High Quality: Locking wheel nut remover set with high power and impact resistance. Bolt nut extractor processed from high hardness chrome molybdenum steel, reverse spiral flutes are designed to bite to provide maximum gripping power. 3/8 inch square drive: puller sets have flat hex bits for use withend wrench, pliers, adjustable wrench, sockets or Vise-Grip locking pliers, 3/8inch square drive for use with ratchets wrenches, impact wrenches, and air ratchets. Design: The spiral socket design allows for a secure connection on the round fastener to be extracted. These bolt nut extractors have a black oxide surface providing greater strength and durability and prevents corrosion. Multifunctional: The twist socket set is suitable for removing rust and wear, as well as to cover the paint coating of nuts, bolts. The bolt extractor provides maximum gripping power to easily remove broken, damaged or rusted nuts, bolts and screws. Package Included: The bolt removal tool kit includes metric and sizes: 1/4inch, 5/16inch(8mm), 3/8inch, 10mm, 7/16inch(11mm), 12mm, 1/2inch, 13mm, 9/16inch(14mm), 16mm), 17mm, 11/16inch, 3/4inch 19mm). Comes with a useful carry case for quick and easy storage.