Set Includes --- 4 x 1/4", 2 x 3/8" and 2 x 1/2" drive with 1/4" hex shank. Two adapters 1/4 (F) to 3/8 inch (M) and 3/8 (F) to 1/2 inch (M) and two reducers in sizes 3/8 (F) to 1/4 inch (M) and 1/2 inch (F) to 3/8 inch (M) drive. Quickly adjust lag bolts and hex bolts. High Quality --- The extension adapters are made of heat treated chrome vanadium steel with a black oxide coating. Adapters and reducers are made of high quality, high strength chrome steel with a manganese phosphate coating to resist rust and corrosion and ensure a lifetime of use. General Use --- This screwdriver extension bar set for hex shank screwdriver is designed for a wide variety of needs. Fits perfectly in drill chuck or hand driver. Consisting of the most common drill bit sizes of 1/4", 3/8" and 1/2", various shank sizes. Provides versatility and convenience no matter what tool you use. Ideal for DIY, home care and general purpose --- This adapter set is designed to provide a securely locked extension of