Kit includes — a 4 x 1/4 , 2 x 3/8 and 2 x 1/2 drive with a 1/4 ’’ hex shaft shank. Two adapters co.ukom 1/4 (F) to 3/8 inch (M) and 3/8 (F) to 1/2 inch (M), and two reducers in drives 3/8 (F) to 1/4 inch (M) and 1/2 drive sizes (F) to 3/8 drive (M). Quickly adjust lag bolts and hex head screws. High Quality — Extension adapters are made of heat treated chrome vanadium steel with black oxide coating. Adapters and reducers are premium high strength chrome steel with a manganese phosphate coating to help resist rust and corrosion and ensure long use life. General Use — This Hex Shank Screwdriver Screwdriver Extension Bar Set is designed to meet a variety of needs. Slips perfectly into the chuck or manual screwdriver. Consisting of your most common 1/4 , 3/8 and 1/2 bit sizes, varying sizes for shanks. Provides versatility and convenience no matter which tool you choose to use. Ideal for DIY, housekeeping and, more generally, r Purpose — This adapter set is designed to provide a