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 with a black Oxide coating, and adapters and reducers are made from high strength, premium chrome molybdenum chrome steel with corrosion resistant manganese phosphate coating, 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 rely on them to work when you need them 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 driver Standard hex shank 1/4", all sockets 1/4 inch Hex Shank to: 1/4 inch square drive x 4pcs 3/8 inch square x 2pcs 1/2 sq. inch x 2pcs 4 Piece Impact Adapter Set Size: Reducer 3/8" (F) to 1/4" (M) 1/2" (F) to 3/8" (M) Reducer 1/4" (F) to 3/8" (M) Drive Adapter 3/8" Drive (F) to 1/2" Drive (M) Adapter Package Included: Set of 8 piece extension - 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 industrial oil and dust when shipped, but not old or used.