The set includes --- 4 screwdrivers 1/4", 2 x 3/8" and 2 x 1/2" with 1/4" hex shank. Two adapters from 1/2" 4 (F) to 3/8" (M) and 3/8 (F) to 1/2 inch (M) as well as two 3/8 (F) to 1/4 inch (M) and quick fit pull screws and hex screws with 1/2 drive size (F) to 3/8 inch (M). HIGH QUALITY --- The adapter extension is made of heat treated chrome vanadium The adapter and reducer are made of high quality, high strength chrome steel with a manganese phosphate coating to prevent rust and corrosion and ensure a long service life The handle screwdriver extension set is designed for a variety of needs. Ideal for drill chucks or hand screwdrivers. The most common bits of 1/4", 3/8" and 1/2" with different size shanks. Whichever tool you choose, it offers versatility and convenience. Ideal for DIY, home maintenance and just in general Purpose --- This adapter set is designed to provide a secure locking extension for your existing tools. Provides extra length to reach many hard to reach places. A