Feaute 1. Fitment: Fit for Caterpillar 3406E, C-15 and C-16. And Engine Barring Socket is compatible with CAT 3200/3406 Series C13/C15/C16/3208/3400/3406e/3508/3512/3500. 2. Material: The Injector Timing Fixture is constructed from high standard Aluminum Alloy, solid and sturdy. The Barring Socket is machined from high quality 42CrMo Steel. Both of them are good in resisting rust and corrosion with powder coated. .