Moroso Crankshaft Socket For Degree Wheel (MO61755)MOROSO CRANKSHAFT SOCKET FOR Suit SB & 90 V6 Chev & Super Duty Pontiac GM 4 Cyl. Part Number: MO61755 Don't use the crank hub retaining bolt to rotate your engine! By removing the crank hub or balancer and using a Moroso Crankshaft Socket Tool, engine builders have a positive way to turn over the engine Tool makes it easier to locate TDC and BDC when degreeing camshafts Broached keyway allows the socket (which fits 1 2" drive) to slide over the