Going through all the stuff I've accumulated over the years and came across the following dies: 1/2-32, 1-32, 3/4-32. All adjustable with a split in the body and an adjusting screw. I seem to remember I found them in a castoff bin in the machine shop at the hangar at the airline I retired from. Did a google search for uses for such threads but not much help. Hoping someone here can enlighten me? Thanks for any help.
Garrett Fulton