【Functions: 6 in 1 Set】Common size combinations multiply the range and capacity of your socket system, making your set very versatile with multiple repair needs 【Design Considerations】Spring-loaded detent balls on the adapters securely lock the sockets. Get the most out of your sockets with this handy set of adapters and reducers that ensure you'll always have the right size for the job. 【Quality Materials】These adapters and reducers are made of high-strength, heat-treated chrome vanadium steel, and the nickel/chrome finish is corrosion-resistant to eliminate the risk of rust for long tool life, for industrial, mechanical, or construction work. 【Easy to Identify】Each socket has its size printed on the socket itself, making it easy to identify after removing a handful from the case. 【Easy Storage】Plastic case for easy storage and transportation of all components, very convenient for your daily use. Product Name: Sleeve Adapter Specifications: 1/4 3/8 1/2 3/4 1 inch mutual rotation Surface treatment: black phosphating Material: 42CR-MO Hardness: (HRC) 40±2 The sleeve adapter is made of chrome vanadium alloy steel, forged as a whole, the surface is black phosphated, and the whole is hardened The set includes: This adapter includes 3 pieces. Reducers and 3-Piece Adapters: 1/4" Drive (F) to 3/8" Drive (M) 3/8" Drive (F) to 1/4" Drive (M) 3/8" Drive (F) to 1/2" Drive (M) 1/2" Drive (F) to 3/8" Drive (M) 1/2" Drive (F) to 3/4" Drive (M) 3/4" Drive (F) to 1/2" Drive (M)getveryrich