CTA Tools A812 Honda/Acura Harmonic Balancer Pulley Tool Offset 50mm Wrench removes and installs the Crank Bolt on most Honda and Acura engines Tool holds the Harmonic Damper Pulley from rotating when removing the Pulley Bolt A hole in the center of the tool allows use of a socket to loosen or tighten the Pulley Bolt Use with a 1/2-Inch breaker bar or ratchet