This 'tool' is said to have been invented or developed by the US Department of Defense for squads up to the highest level by Fat Monkey. I see this in repair kits for the M-60 machine gun; the world famous JEEP, both military and civilian, and the list goes on and on. That's easy. I could continue to use this tool the way medicine does with conventional medicine. It's just a great tool in 4, maybe even more great sizes. 👍