Features: 1.UNIQUE DESIGN:Need to manually rotate an engine? This tool makes the job easy. 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. Works on Cummins B and C series diesel engines and 5.9L liter diesels used in Dodge pickups. 2.SUPERIOR QUALITY:Machined from high quality 42CrMo Steel to ensure great tolerance and resistance to corrosion and rust. 3.FEATURES:High quality 42CrMo Steel ensure great tolerance and good performance. 4.TIME SAVER:With this tool it takes less time to turn the engine over or to turn the crank while preforming valve lash adjustment! .