Quality Material These adapters are made from high-strength, heat-treated chrome vanadium steel with a corrosion-resistant black oxide finish. They are nickel/chrome plated to resist corrosion, which eliminates the risk of rust and extends the life of tools used in industry, mechanics or construction. Well Built Gearboxes Heavy duty socket drive adapters feature a built-in ball lock that holds them firmly on the socket and prevents them from tipping. They guarantee uninterrupted operation for many hours, while improving the precision and efficiency of work on the car or vehicle. One Shop The kit includes 1/4" to 3/ 8", 3/8" to 1/4" adapters, 3/8" to 1/2" adapters, 1/2" to 3/8" adapters, 1/2" to 3/4" adapters , 3/4" to 1/2" adapters These powerful impact adapter reducers are designed for impact drivers and most tools to convert driver size sets into your kit for all improvement jobs home or automobile. Easy to Identify We have printed the dimensions of each product on its surface to allow you to better identify the model, and everything is stored in a red plastic box for easy storage and transportation of all parts, which is very convenient for your daily use. Easy Storage Plastic box for easy storage and transportation of all components, very convenient for your daily use.