15 pcs Screw Extractor Kit Sizes Included: All stud removal socket set sizes are engraved on the socket for easy identification: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2". (Includes: 3/8"M x 1/2"F adapter, 1/4"*3/8" connecting rod.) High Quality and Durable: All bolt extractors are made of high-hardness chrome-molybdenum steel, the surface is sandblasted for rust resistance, and heat-treated for excellent durability. As an upgraded version of the double-head design, it can be directly connected with a wrench without a connecting sleeve. It is more convenient and faster to solve the problem of difficult removal of damaged bolts. Hexagonal Head Design: Extractor Set features a unique hexagonal head multi-spline design that provides maximum torque with wrenches and sockets. Internal left-hand spiral design provides extra grip and faster tapping speed. Extra Adapters: With standard 3/8" drive and hex adapters, the extractor can be used with heavy-duty power tools, drivers, and screwdrivers. Ejector pins make extraction easier. Multiple Uses: The screw extractor set can be used to extract broken studs, bolts, socket screws, and accessories, or can be used with a hex drill bit for a wider range of applications. Suitable for installation and repair of automotive, machinery, equipment, and more. All components of the set are securely packed in a durable blow-molded carrying case Each strip bolt remover socket set is manufactured from high-hardness CR-MO steel for superior durability and lifespan and is stored in a heavy-duty case