1、HIGH HARDNESS MATERIAL: These 13 sockets are made of high density and hardness chrome molybdenum steel for excellent strength and durability 2、BOTH METRIC AND SAE SIZES: 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 3、WITH CLEAR LABEL: Each is clearly labeled for easy reference and organized in their blow molded carrying case for easy storage or transport between jobs 4、MAXIMUM TORSION: Each part of this 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. 5、EASILY PRY FASTENERS: Nut and bolt extraction tools can easily pry open rusted, peeling and frozen fasteners, useful and practical 1 x Impact Nut Bolt Remover Set(13pcs)1 x Storage Box Item Type: Impact Nut Bolt Remover SetMaterial: Durable high hardness chrome molybdenum steelColour: BlackDriver: 3/8inApplicable 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