Park Tool pedal thread taps. If you have damaged pedal threads or lots of material filling them in your cranks can may sort them out.
9/16" is the treading for all road and MTB pedal thread except some BMX and on some older french bikes which had a metric thread.
1/2" is the threading used on some traditional BMX bikes
The Cycle Clinic can restore stripped threaded, the taps cannot restore stripped threads another tool is needed for that which we have.