Set Includes--- 4 x 1/4", 2 x 3/8", and 2 x 1/2" Drive each with a 1/4'' hex shaft shank. two adapters in 1/4 (F) to 3/8-inch (M) and 3/8 (F) to 1/2-inch (M) sizes, and two reducers in 3/8 drive (F) to 1/4-inch drive (M) and 1/2 drive (F) to 3/8-inch drive (M) sizes. Set lag bolts and Hex head screws quickly.v High Quality---The extension adapters are made of heat treated Chrome Vanadium steel with a Black Oxide coating, and the adapters and reducers are made from high-strength, premium Chrome Moly Steel with a Manganese Phosphate coating to help resist rust and corrosion and ensure a life time of use. General Usage---This Hex Shank Bit Driver Extension Bar Set is designed to meet a variety of needs. Fits snugly and securely in your drill chuck or hand held driver. Consisting of your most common bit sizes 1/4", 3/8", and 1/2" changing shank sizes. Provides versatility and convenience no matter which tool you chose to use. Great for the DIY, household maintenance, and most general repairs, not for industrial work. A great tool addition to any tool box set. Purpose---This adapter set is designed to provide a securely locked in extension to your existing tool. Provides additional length to reach into a multitude of hard to reach spaces. The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Specifically machined to fit securely into a hand held driver, drill driver or impact wrench.Spring loaded ball bearing on square driver head holder sockets securely. High Quality Extension sets are made from heat-treated Chrome Vanadium steel with a Black Oxide coating, and the adapters and reducers are made from high-strength, premium Chrome Moly steel with a corrosion-resistant Manganese Phosphate coating, so you know this set is made to last Features These impact extensions are 1/4-inch hex shank and are made of heat treated Chrome Vanadium steel with a Black Oxide coating, so you'll be able to count on them to work when you need them to and stand up to high-torque situations. 8pcs Drill Socket Adapter Size: Suitable for all sockets, for direct drive via the drill chuck or with a holder 1/4 "hexagon All Sockets Standard 1/4" Hex Shank 1/4 inch Hex Shank to: 1/4 inch square drive x 4pcs 3/8 inch square drive x 2pcs 1/2 inch square drive x 2pcs 4pcs Impact Adapter Set Size: 3/8 in. drive (F) to 1/4 in. drive (M) reducer 1/2 in. drive (F) to 3/8 in. drive (M) reducer 1/4 in. drive (F) to 3/8 in. drive (M) adapter 3/8 in. drive (F) to 1/2 in. drive (M) adapter Colour: Black Package Included: 8Pcs Extension Set - 1/4" 3/8" 1/2" 4Pcs Socket Adapter - 1/4" to 3/8" - 3/8" to 1/4" - 3/8" to 1/2" - 1/2 "to 3/8"