JTENG Socket Adapter Set Converter Set And Reducer Set (4 Pieces) + Power Extension Bit Set for Drill 1/4", 3/8", 1/2" Power Extension Bit Set (3 Pieces) 3pc+4pc combination: 3-piece long adaptor set+4-piece converter set 3-piece extra long adaptor set, Set includes sizes: 1/4, 3/8 and 1/2 (inch) 3-piece adaptor set made from chrome vanadium steelComplete with ball bearing locking head, Turns any power drill into a power nut driver; display packed 4-piece converter set, Nickel/chrome plated adapters 4-piece converter Set 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)