I agree with Branson,,,,,tire chain repair tool.
I have personally put rings in Hog's noses when I was ten years old till 20 years old.
My pliers used did not look like this.
Big old hogs were a bitch to move from pen to pen. You just had to move them out to clean up the mess they always made.
They just loved to wallow in their own pig-shit.
Their nose was tender and sensitive.
Even humans a long,long time ago were controlled with this method.