Ratchet Adapter Set Includes ---4 piece socket 1/4 to 3/8 - 3/8 to 1/4 inch - 3/8 to 1/2 - 1/2 to 3/8< /p> High Quality---Extension adapters are made of chrome steel.Adapters and reducers are premium high tensile chrome steel with a manganese phosphate coating to help resist rust and corrosion and ensure a lifetime of use. Purpose General Use --- This Hex Shank Screwdriver Extension Bar Set is designed to meet to a variety of needs.Provides versatility and convenience no matter which tool you have chosen to use. Purpose ---Spring-loaded ball lock ensures a tight fit in the driver's head to prevent slipping in use. Specially machined to fit securely in a hand screwdriver, drill key or impact wrench. The ball bearing ch. Ideal helper for life and work< /p> Durable material Each piece is made from heat-treated chrome-vanadium steel with a chrome finish for added durability and corrosion resistance to give them a long life. extended life without rust and corrosion from normal wear. drills and drivers as well as ratchet and hand wrenches. Multi-size matching The set contains a variety of sizes, you can freely choose from to match wide application in automotive repairs, household maintenance, and most general repairs. Components Included 1/2" to 3 /8" - (12.5mm square hole to 9.5mm square head) Length: 36mm 3/8" to 1/4" - (9.5mm square hole to 6.3mm square head ) Length: 26mm 3/8" to 1/2" - (9.5mm square hole to 12.5mm square head) Length: 35mm 1/4" to 3 /8" - (6.3mm square hole to 9.5mm square head) Length: 25mm Additional durability Each piece is coated with an oxide coating that provides added protection against dirt and grime, providing a corrosion resistant finish. Spring-loaded detent ball p> The chamfered edges and spring-loaded detent ball ensure will provide a snug and secure fit, allowing you to save time and easily complete repair tasks. Multiple Sizes Designed to be used with impact drivers, common size combinations in the 4-piece impact adapter and reducer set multiply the reach and capacity of your existing socket system, more options are given to cope with the unexpected.