1. ALL PURPOSE SOLUTION: suited for a range of hex bolts and nuts. This wrench extension tool is designed to complement 1/2' or 21mm hex wrench, promising effortless use in various applications with unmatched compatibility and reliability. 2. Wide Range of Applications: Widely used in automotive maintenance and installation of mechanical equipment, our wrench extension tool effortlessly handles both professional machine repairs and daily home repairs with ease, making it the helper for various application scenarios. 3. Practical Upgrade: Improve your work experience with the efficient plug interface of the wrench extension tool, for saving time and optimizing workflow. 4. Material: quality materials ensure the durability and longevity of this wrench extension tool under harsh working conditions. Its wear and impact resistance, thanks to its strength alloy steel construction, make it the ideal choice for tough tasks where other tools may fail.