1.385in ID with 3/16in and 1/4in keyways. Engine work requires repeated crankshaft rotation. This non-marring, aluminum tool rotates the crankshaft the proper way, when the balancer is off. Making sure to have the proper size, position this socket over the end of the crankshaft, so it can be turned using a 1/2in breaker bar or drive ratchet. Product Features:Fits Small Block Ford, Buick and Pontiac EnginesFits 1.385 ID Crank Snout with 3/16-in. and 1/4-in. KeywaysMade from High-Quality AluminumNatural Finish1/2-in. Drive for Use with Breaker Bar or Drive Ratchet
