I you want to buy new ring and you are not sure with the size this is perfect tools for you to find it.

I wanted to avoid different chart conversion so I just made ring with inner ring diameter in millimeters.

So for example ring with number 14 has inner diameter 14mm.

I did just few values but I can extend it.

I also uploaded rings without numbers if you want to wear it longer time.

Thickness of the rings is 3mm