Socket set includes: This adapter set includes 3 pieces. Reducers 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) adapter High quality socket set: these adapters and reducers are made of high strength chrome vanadium steel, heat treated and have a corrosion resistant nickel/chrome finish for industrial, mechanical or construction work -High quality socket set: these adapters and reducers are made of high strength chrome vanadium steel, heat treated and have a corrosion resistant nickel/chrome finish for industrial, mechanical or construction work. These adapters meet and exceed ANSI/ASME standards -Very convenient socket set: Each socket has its dimensions etched on the socket itself, making it easy to identify after removing a handful from the case -Easy to Store: All parts are well packed and assorted in a plastic box for easy storage and transport. It can also simplify repair work