For easy removal of most harmonic balancers and drive pulleys which are press-fitted onto the crankshaft Unique disc design intended for trouble free removal of harmonic balancers Range of metric and imperial sized bolts and adaptors provide a wide coverage Heavy duty ¾” diameter forcing screw is internally threaded to fit adaptors Supplied with eight adaptors which maintain a common thread on one end to fit into the forcing screw Includes three each of the following bolts M8 x 1.25, M10 x 1.00, M10 x 1.25 (length: 65mm each)