Flywheel Lock.
Holds flywheel in place when removing or replacing the crankshaft bolt.
For 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax
LB7 LLY LBZ LMM LML
Holds flywheel in place when removing or replacing the crankshaft bolt. Simply remove the inspection window cover on the transmission, slide the flywheel lock tool through the inspection window until flywheel is engaged for removal of crankshaft.