As my tests showed, this product is a complete waste of money .It was supposed to make replacing crankshafts easier, but it just made the job harder and more frustrating. The pros are non-existent. The only pro is that it was packaged nicely. The cons are plentiful: the instructions were confusing, the tool was flimsy and broke easily and it didnt work as advertised. Save your money and look for a better tool elsewhere..