3pc combination + 4pc: 3 piece long series adapter + 4 piece product converter set;These 4 sockets to adapt pawls, spring ball bearing fixing3 chrome vanadium steel adapter set pieces, complete with locking head ball bearing, Turns any electric drill into an electric nut driver; packaged display4-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 durable chrome-vanadium steel rust-proof 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, ratchethandles, 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 steel suitable for heavy impact motors.Spring loaded ball bearing on head rests sockets securely.Suitable for Quick Change 1/4 in Chuck Systems or straight into the drill bitThis set is perfect for your impact driver or drill bit, and you allows you toreplace your ratchet with a power tool.The 1/4 in hex shank fits all quick change chucks as well as standarddrill chucks1/4 in: 66 mm Long< p>3/8 in: 64 mm Long1/2 in: 72 mm LongPackage includes:1 x (1/4 in hex rod to 1/4 in socket) Socket adapter1 x (1/4 in hex rod to 3/8 in socket) Socket adapter ;1 x (1/4 in hex rod to 1/2 in socket) Socket adapter4 x Socket Converter Set Converter & Reducer Set< /p>