OUR PRY-BARS WERE DESIGNED IN THE USA, MADE IN THE USA, AND ARE MADE FROM OUR SECRET GOV STEEL.
I recently saw that the English wrote a book for their intelligence people on "How to make lock-picks" and in that book they had a square cut "top of key-way” turning tool. (That would be bottom of key-way of course in Europe). So I stand corrected, I did not invent the flat top of keyway turning tool, I just designed the first that I knew of! :-)
A customer recently shared with me:
"It does not matter what width of non-Peterson turner you use, the shape of that keyway, when tensioning clockwise, drives them all out of that keyway. The Peterson Turner, by design, stays in the keyway. Light or heavy tension, does not matter."