Crankshaft Turning Socket Chevy S/B, V6, 4-Cylinder Fits Small Block Chevy, Chevy V6 and 4 Cylinder Engines Fits 1.255 ID Crank Snout with 3/16 Inch Keyway This non-marring, aluminum tool rotates the crankshaft the proper way, when the balancer is off Natural Finish Features 1/2 In. Drive for Use with Breaker Bar or Drive Ratchet