Milwaukee 5-1/2" x 7/16" Hex Lock Extension Bit is designed to accept a 7/16" hex, making it versatile for various fastening tasks. This extension bit is compatible with 3 jawed chucks, drills with a 1/2" capacity or larger, and 7/16 quick change chucks, ensuring a secure fit and reliable performance during use. Its robust construction and precise design make it an essential tool for professionals and DIY enthusiasts alike, providing both durability and convenience in one compact accessory. Model Number: 48-28-4001