With 6-in-1 functionality, the common size combination doubles the reach and capacity of your jack system, making your unit extremely versatile for multiple repair needs. SET INCLUDES: This adapter set includes 3 pieces. Reducer and 3 pieces. Adapters: 3/8" (F) to 1/4" Drive (M) reducer, 1/2" Drive (F) to 3/8" Drive (M) reducer, 1/4" Drive (F) to 3 adapter /8" drive (M), 3/8" drive (F) to 1/2" drive (M) adapters. DESIGN GUIDE: Adapter spring ball locks securely into socket, get the most out of your socket with this handy set of adapters and reducers, ensuring you always have the right size for the job. High Quality Materials: These adapters and reducers are made of high strength chrome vanadium steel, heat treated and have a corrosion resistant nickel/chrome finish, suitable for industrial, mechanical or construction projects. These adapters meet and exceed ANSI/ASME standards.