Need to replace a crank?  You will need a puller to remove it from its pressed fit.  MUST HAVE tool to have on hand for quick change outs and repairs.  Puller tool only.  Make sure to check out the combination set that includes the multi function pedal wrench that also has a 16mm wrench to work with this puller!  Make sure threads are completely into the crank before attempting to remove to avoid thread damage.