1. FITMENT: Works on Cummins B and C series diesel engines and 5.9L liter diesels used in Dodge pickups 2. USING:Just insert the tool into the flywheel housing until it engages the ring gear, then attach a 1/2 inch square drive ratchet or breaker bar and turn 3. FEATURES:This tool fits the flex plate teeth perfectly, and its load-bearing collar provides friction-free operation while rotating the tool in the housing - Rotating the engine is so easy Engine Barring Tool The Old Way of Using a Screwdriver or Pry Bar to Turn the Engine Over is History! High quality ensure great tolerance and good performance Time saver:With this tool it takes less time to turn the engine over or to turn the crank while preforming vae lash adjustment! colour:black Material:metal