The PRO-FLEX LLC Extension Kit features a 5/16" socket and a 21" length, designed for enhanced reach and accessibility in tight spaces. This kit includes alignment bushings for precise fit and functionality, ensuring optimal performance during use. Made from high-quality materials, the extension kit is built to withstand rigorous use in various applications. Its compatibility with standard sockets makes it a versatile addition to any toolkit. Ideal for automotive and mechanical tasks, this extension kit meets industry standards for quality and reliability, making it a must-have for professionals and DIY enthusiasts alike.