Tonsiki 8pcs Socket Adapter/Extension Set Turns Power Drill Into High Speed Nut Driver. 1/4", 3/8", and 1/2" Drive General Usage: This 8 piece 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 1/3" 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. Multifunction: used in the installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hexagonal tool .It is a good accessory for conversion. Safety and Durable: Chrome Vanadium Steel material suitable for heavy impact conductors. Includes:8Pcs - 4 x 1/4", 2 x 3/8", and 2 x 1/2" Drive each with a 1/4'' hex shaft shank.Set lag bolts and Hex head screws quickly.