Size Guide

US Ring Size Inner Diameter (mm)
2 13.3
2.5 13.7
3 14.1
3.5 14.5
4 14.9
4.5 15.3
5 15.7
5.5 16.1
6 16.5
6.5 16.9
7 17.3
7.5 17.7
8 18.1
8.5 18.5
9 19.0
9.5 19.4
10 19.8