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" 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 Adapter sizes included: M16 x 2.0, M14 x 1.5, M12 x 1.5, 1/2"-20, 7/16"-20, 3/4"-16, 5/8"-18 and 9/16"-18.