Originally Posted by Gummee!
If you get the Park tool, they usually have 2 sides: Shimano and Campy. The thread pitches are different enough that you *shouldn't* be able to screw one into the wrong crank
The current Park tools just have the 22mm thread, which is Campy, Shimano, and nearly every other commonly encountered crankset with threaded arms.
The old Park tool had 22mm on one side, and 23mm on the other for TA cranks. ;-)