1.225in ID with 3/16in keyway. 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 Chevy, Chevy V6 and 4 Cyl. EnginesFits 1.255 ID Crank Snout with 3/16-in. KeywayMade from High-Quality AluminumNatural FinishFeatures 1/2-in. Drive for Use with Breaker Bar or Drive Ratchet
