Performance Tool W30935 7pc 7 Piece Socket Adpater and U-Joint Set Adapter sizes: 1/2 to 3/8", 3/8 to 1/2", 3/8 to 1/4" and 1/4 to 3/8". U-Joint sizes: 1/4, 3/8 and 1/2". Polished nickel chrome plated finish resists corrosion. Chrome vanadium alloy steel construction for strength and durability. Reusable socket rack. To release the sockets, just twist the sockets counterclockwise until you hear it click