OTC 4531 Harmonic Balancer Puller and Installer Set For easy removal of most harmonic balancers and drive pulleys which are pressed fitted onto the crank shaft A bearing-centered circular 2/3-way and an assortment of metric and fractional bolts and adapters provide wide coverage A heavy duty, 3/4 inch diameter forcing screw is internally threaded to fit the eight adapters to install harmonic balancers A blow molded plastic storage case keeps set contents organized and protected from loss