The ratchet adapter kit includes --- 4 sockets 1/4 to 3/8 - 3/8 to 1/4 - 3/8 to 1/2 - 1/2 to 3/8. HIGH QUALITY --- The extension adapter is made of chrome steel The adapter and reducer are made of high quality high strength chrome steel with manganese phosphate coating to help prevent rust and corrosion and ensure a long service life. GENERAL USE --- This Hex Handle Screwdriver Extension Set is designed to meet a variety of needs.Whatever tool you you choose to use, it offers versatility and convenience. Purpose --- Spring-loaded ball lock ensures a tight fit on the drivers head to prevent slipping during use.Specially machined to securely fit hand screwdrivers, drill wrenches or impact wrenches. After-Sales Service --- We will provide you with the most friendly customer service.If you have any s questions ur the item, please feel free to contact us. Ideal helper for life and work durable material Each part is made of steel heat-treated chrome vanadium and is chrome plated for added durability and corrosion resistance for extended life without rust or corrosion from normal wear. Drill and screwdriver as well as ratchet and hand wrench. Multiple sizes The set contains a variety of sizes, you can choose freely to match widely used in auto repair, home repair and most general repairs. Extra Durability Each piece is oxide coated for added protection against dirt and stains, providing a corrosion-resistant finish. Spring-loaded ball The chamfered edges and spring-loaded positioning ball will ensure a perfect fit, allowing you to save time and perform easily repair tasks. Multiple Sizes Common size combinations in the 4-Piece Impact Adapter and Reducer Set are designed for impact riders to to increase the reach and capacity of existing socket systems, providing more options for si unexpected kills.