Clean out or restore damaged threads in crank arms with Park Tool's Pedal Taps. They're 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. - Includes a set of 2 taps, 9/16" x 20 tpi - Made of high carbon steel, precision ground, and hardened to stay sharp - Fits all conventional tap handles The tap drill size for a 9/16-inch x 20 tpi thread is nominally 33/64-inch.