Features: 1. Compatibility: Fit for GM 6.6L Duramax Diesel 2001 – 2020. Replacement for J-45910. 2. Material: Made of exceptional performance and longer life steel, with strong durability, corrosion resistance and anti-rust performance. High-quality materials allow it to be used for a long time. 3. Function: Designed to removes injector tubes for service and re-installs, helps diesel mechanic get their job done right. And without damaging the injector cups. 4. Usage: There is no need to remove any rocker arms or valve springs. Simply fully seat the tool in the injector, this tool will make removing/installing injector tubes a breeze. .