Honda Acura 50mm Hex Crankshaft Crank Damper Pulley Holding Wrench Tool This 50mm crankshaft pulley holder tool is designed to aid in the removal and installation of the crank bolt on most Honda? and Acura? engines. Used with a 1/2 in. breaker bar or ratchet, this specialty tool prevents the harmonic damper pulley from rotating while you're removing and setting the final torque specification on the pulley bolt. The tools design features a hexagonal shape with a hole in the center of the tool that allows the use of a socket and extension to help loosen or tighten the pulley bolt.