Application: Works on Caterpillar (CAT) C-10, C-12, C-15, C-16, C-18 and 3406E Engines. (The new puller bridge can be used on all three engines). Replacement: Alternative to 9U-6891. Superior Material: Advanced heavy duty steel process, durability, anti-corrosion, high precision and hardness to provide a much longer service life. Benefits: Used to install and remove injector sleeves. Works in a easier way to save your time and money. Easy To Use: Following the instruction, it will be easy to remove and Install the Injector Sleeve. .