6-in-1 Set: Common size combinations multiply the reach and capacity of your socket system, making the set very versatile for multiple repair needs. Spring-loaded detent balls on adapters securely lock sockets, get the most out of them with this handy set of adapters and reducers and ensure you always have the right size for your jobs.Quality materials. These adapters and reducers are made of high strength, heat treated chrome vanadium steel. The nickel/chrome finish is corrosion resistant and eliminates any risk of rust, to ensure long tool life, for industrial, mechanical or construction work. These adapters meet and exceed ANSI/ASME standards. Easy to identify. Each bit is marked with its size, making them easy to identify when you've removed them from the case. Easy storage. Plastic case for easy storage and transport of all components, very convenient for your daily use.