3pc combination + 4pc: 3 piece long series adapter + 4 piece product converter set; These 4 sockets to adapt pawls, spring ball bearing fixing 3 chrome vanadium steel adapter set pieces, complete with locking head ball bearing, turns any electric drill into an electric nut driver; packaged display 4-piece converter includes sizes 1/2-inch (F) x 3/8-inch (M), 3/8-inch (F) x 1/4-inch (M), 3/8-inch (F) x 1/2-inch (M), 1/4-inch (F) x 3/8-inch (M) Made of durable chrome-vanadium steel, rustproof for long lasting handles, handles the toughest jobs, hex 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 Extension Adapter Set: Chrome vanadium steel suitable for heavy impact motors. Spring loaded ball bearing on head keeps sockets secure. Suitable for Quick Change 1/4 in Chuck Systems or straight into the drill bit. This set works with your impact driver or drill bit, allowing you to replace your ratchet with a power tool. The 1/4 in hex shank fits all quick-change chucks as well as standard drill chucks. 1/4 in: 66 mm Long 3/8 in: 64 mm Long 1/2 in: 72 mm Long Package includes: 1 x 1/4 in hex shank to 1/4 in socket adapter 1 x 1/4 in hex shank to 3/8 in socket adapter 1 x 1/4 in hex shank to 1/2 in socket adapter 4 x sockets converter and reducer set