GearWrench 3970D 1/2” Drive Honda Acura Crankshaft Holding Tool The GearWrench 3970D 1/2” Drive Honda Acura Crankshaft Holding Tool holds crankshaft in place allowing for removal of hard to loosen crankshaft damper bolts, the proper angle ensures easy access to crankshaft damper bolts, fits most Honda & Acura 4 Cylinder applications from 1990 and up, is an easy to use one man operation tool that speeds up repair, and works with 1/2” square drive.