Function: 6-in-1 Set: Common size combinations double the reach and capacity of your socket system, making your set very versatile and capable of responding to any need. a variety of maintenance requirements [Design Tips] The adapter for the spring is locked. Use this handy adapter and reducer kit to get the most out of your sockets, ensuring you always have the right size for the job. High-quality materials. : These adapters and reducers are made of heat-treated chrome vanadium steel and have a corrosion-resistant nickel/chrome surface to eliminate the risk of rust and extend the life of the tool. construction jobs. These adapters meet and exceed ANSI/ASME standards [Easy to install; identify] The size of each socket is printed on the socket, it is easy to measure. identify after removing the handle from the housing Easy to use store: plastic housing, easy to store sort and clean carries all components, very practical for daily use