Product Feature: . Fitment: Fits for Dodge Pickups 3.9L, 5.9L, 6.7L & 8.3L diesels engines and Cummins B/C Series diesels engines . Superior Quality: Machined from high quality 42CrMo Steel to ensure great tolerance and resistance to corrosion and rust. . Using: Just insert the tool into the flywheel housing until it engages the ring gear, then attach a 1/2" square drive ratchet or breaker bar and turn. . Time Saver: With this tool it takes less time to turn the engine over or to turn the crank while preforming valve lash adjustment! .