Park Tool TAP-6C Pedal Taps 9/16
Clean out or restore damaged threads in crank arms with these pedal taps. Sold as a set of right and left hand threads. Made of high carbon steel, precision ground, and hardened to stay sharp, they cut easily and fit all conventional tap handles.
These are one of those items that you don't need often but sure are nice when you do. I purchased these a few years ago after I tried to swap out a set of pedals in to much of a hurry and cross threaded them. Ran these through once real quick and was good to go!