Features Chrome Molybdenum Steel Material: These 13 nut bolt extractor sockets are made of high density and hardness chrome molybdenum steel for excellent strength and durability. Both Metric and SAE Sizes: The bolt remover is available in most common metric and SAE sizes of 1/4in, 5/16in or 8mm, 3/8in, 10mm, 7/16in or 11mm, 12mm, 1/2in, 13mm, 9/16in or 14mm , 5/8in or 16mm, 17mm, 11/16in, 3/4in or 19mm. With Clear Label: Each bolt extractor is clearly labeled for easy reference and organized in their blow molded carrying case for easy storage or transport between jobs. Maximum Torsion: Each part of this impact bolt nut remover socket kit for stubborn nut removal has six contact points and internal helical design to provide maximum grip and torsion when you pry apart damaged, corroded and coated nuts, bolts, lugs, studs, hex screws, etc.. Easily Pry Fasteners: The impact nut and bolt extraction tool set can easily pry open rusted, peeling and frozen fasteners, useful and practical. Specification: Item Type: Impact Nut Bolt Remover Set Material: Durable high hardness chrome molybdenum steel Colour: Black Driver: 3/8in Applicable Tools: 3/8in square driver for use with hand ratchets, impact wrenches and air ratchets, extractor kit with hex flats for use with flat wrenches, pliers, adjustable wrenches, and sockets Package List: 1 x Impact Nut Bolt Remover Set(13pcs) 1 x Storage Box Package List 1 x Impact Nut Bolt Remover Set(13pcs) 1 x Storage Box