Set includes --- 4 x 1/4", 2 x 3/8" and 2 x 1/2" drive with 1/4'' hex shaft shank. Two 1/4 (F) to 3/8 inch (M) and 3/8 (F) to 1/2 inch (M) adapters, and two reducers in 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 --- The extension adapters are made of chrome vanadium steel heat treated with a black oxide coating. Adapters and reducers are made of high-strength premium chrome steel with a manganese phosphate coating to help resist rust and corrosion and ensure a lifetime of use. Purpose General Use --- This Hex Shank Screwdriver Extension Bar Set is designed to meet a variety of needs. Fits perfectly into the chuck or manual screwdriver. Comprised of your most common drill bit sizes of 1/4", 3/8" and 1/2", varying sizes for shanks. Provides versatility and convenience no matter which tool you choose to use .Ideal for DIY, household maintenance and general r Purpose --- This adapter set is designed to provide a securely locked extension to your existing tool. extra length to access a multitude of hard-to-reach spaces Spring-loaded ball latch ensures a tight fit in the driver's head to prevent slipping during use Specially machined to fit securely in a hand screwdriver , a drill key or an impact key.The ball bearing ch High quality The extension sets are made of chrome vanadium steel treated thermally coated with a black Oxide coating, and the adapters and reducers are made from high strength, premium chrome-molybdenum chrome steel with a phosphate coating corrosion resistant manganese, so you know this set is built to last Features These extensions are made of 1/4 inch hex shanks and are heat treated. Chrome vanadium steel with a black oxide coating, so you can count them to work when you need them. need and to withstand high torque situations. 8pcs Drill Socket Adapter Size: Suitable for all sockets, for direct drive via chuck or with 1/4" hex shank Standard 1/4" hex shank, all sockets 1/4 inch Hex Shank to: 1/4 square inch drive x 4pcs 3/8 square inch x 2pcs 1/2 square inch x 2pcs 4 Piece Impact Adapter Set Size: 3/8" (F) to 1/4" (M) Reducer 1/2" (F) to 3/8" (M) 1/4" (F) to 3/8" (M) Drive Adapter Drive Adapter 3/8" Drive (F) to 1/2" Drive (M) Package Included: 8 Piece Expansion Set - 1 /4" 3/8" 1/2" 4 Piece Socket Adapter - 1/4" to 3/8" - 3/8" to 1/4" - 3/8" to 1 /2" - 1/2" to 3/8" Note: Due to the special nature of the products, these tools may contain oil and dust industrial when shipped, but they are not old or used.