HD Harmonic Crank Pulley Puller For use crank pulley dampeners without female threaded holes such as GM LS engines, Ford Coyote and more. Heavy duty grade 9 drive bolt (class 12.9) 78450 WARNING: This product can expose you to chemicals including Gasoline engine exhaust (condensates/extracts) which is known to the State of California to cause Cancer and Ethylene glycol (ingested)which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Gasoline engine exhaust (condensates/extracts)