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