Usage Tips:1. FITMENT: Works on for Cummins B and C series crude oil engines and 5.9L liter crude oil used in pickups2. 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 turn3. 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 easyEngine Barring ToolThe Old Way of Using a Screwdriver or Pry Bar to Turn the Engine Over is History!High quality ensure great tolerance and good performanceTime saver:With this tool it takes less time to turn the engine over or to turn the crank while preforming valve lash adjustment!colour:blackMaterial:metalPackage Contents:1* for Cummins Engine Barring/Rotating ToolOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.