Feature●Fits Small Block Ford, Buick and Pontiac Engines●This non-marring, aluminum tool rotates the crankshaft the proper way, when the balancer is off●Fits 1.385 ID Crank Snout with 3/16" and 1/4" Keyways●1/2" Drive for Use with Breaker Bar or Drive Ratchet●Natural FinishDescription Designed to be used with big block Chevy engines, this non-marring aluminum tool rotates the crankshaft when used with a 1/2-Inch breaker bar or drive ratchet.