Features: Product Name Bolt Nut Extractor Extractor Socket Tool Set Material 40Cr chrome vanadium steel SAE Size 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16 " Metric Size 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, 19mm Quantity 13 pcs × bolt nut extractor Features: 1. Fits most tools - with a 3/8" square drive for use with hand ratchets, impact wrenches and air ratchets; hexagonal flats for use with a spanner, pliers, adjustable spanner, sockets. 2. Made of 40Cr chrome vanadium steel which is stronger than tool steel, ensuring longer life and greater durability. 3. 1/4"", 5/16""(8mm), 3/8"", 10mm, 7/16""(11mm), 12mm, 1/2"", 13mm, 9/16""(14mm) , 5/8""(16mm), 17mm, 11/16"", 3/4""(19mm). Can be used on SAE and metric sizes. 4. Suitable for all types of bindings. Package included: 13 x Bolt Nut Extractor 1 xBox