The Astro Tool 78450 HD Harmonic Crank Pulley Puller - GM LS, Ford Coyote, GMC, Chrysler, Dodge & Jeep features a heavy duty grade 9 drive bolt (class 12.9) for long lasting impact rated use and is designed for crank pulley dampeners without female threaded holes such as the “3 winged” examples found on many Ford and GM V8's. A simple dependable cost effective solution for quick removal of these harmonic dampers.