The STEELMAN 42021 Honda and Acura 50mm Crankshaft Holding Tool gives you the secure hold you need when breaking free stubborn crankshaft bolts. Made of durable steel it easily holds up to the extreme stresses involved in the process of breaking free such bolts. Designed specifically for use on Honda and Acura engines this holder keeps the crankshaft in proper alignment allowing the removal and installation of crankshaft damper bolts when servicing the engine and timing pulley. It is made to be used with a 1/2-inch drive breaker bar.