3pc combination + 4pc: 3 piece long series adapter + 4 piece product converter set; These 4 torx sockets to adapt the ratchets, soilde material, fixing by spring ball bearing 3 Piece Chrome Vanadium Steel Adapter Set, Complete with Ball Bearing Locking Head, Turns Any Electric Drill into an Electric Nut Driver; packaged display 4-piece converter includes sizes 1/2-inch (F) x 8/3-inch (M), 3/8-inch (F) x 1/4-inch (M), 3/8-inch (F) x 1/2 inch (M), 4/1 inch (F) x 8/3 inch (M) Made of rust-resistant chrome-vanadium steel for long-lasting handles, the toughest jobs Hexagonal shaft saves time. Saves time on traditional manual braces. Features: 4Pcs Socket Adapter, Converter And Reducer Set: Set of four female adapters, converters and reducers. Allows you to mix and match drive sizes for your sockets, ratchet handles, extensions and other accessories. 3/8" (F) to 1/4" (M). 1/2" (F) to 3/8" (M). 3/8" (F) to 1/2" (M). 1/4" (F) to 3/8" (M). 3Pcs Hex Hex Extension Adapter Set: Chrome vanadium