Socket set includes: This adapter set includes 3 pieces. Reducers and 3 pieces. Adapters: 3/8" Reducer (F) to 1/4" Drive (M), 1/2" Drive (F) Reducer to 3/8" Drive (M), 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 chrome vanadium steel high strength, 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 from chrome steel high strength vanadium, heat treated and have a corrosion resistant nickel/chrome finish for industrial, mechanical or construction work. -Very practical socket set: Each grip has its dimensions engraved on the grip itself, making identification easy after removing a grip from the case -Easy to store: all parts are well packaged and matched in a plastic box for easy storage and transport. It can also simplify repair work