Part Number 9U-6891 9U-7227 J-38587-a Application Fit for Caterpillar CAT 3406E C-15 C-16 Engines Feature Superior Quality: Premium grade heavy duty steel process, durability, anti-corrosion and anti-rust, high precision and hardness to provide a much longer service life. Function: Used to install and remove injector sleeves. Works in a easier way to save your time and money. Upgrade Design — Used to install and remove injector sleeves. Easily & Precisely adjust the Injector Height of the engine and easy to rotate the engine. .