Danaher Tool Group Jacobs 1/2" Drill Chuck & Key is a high-quality drill chuck designed for 1/2" drills. It has a capacity of 5/64" - 1/2" - 20M, making it suitable for a wide range of drilling tasks. The chuck features a tested design normally found only in industrial-grade chucks, ensuring durability and reliability. It also includes a KK Chuck Key for easy tightening and loosening of the chuck.