How to work out ring size?
1. Use a piece of string and wrap it around the base of your finger.
2. Next use a pen to mark the point on the string where the end meets.
3. Place the string on the ruler, to measure the length of the string till the point that you have marked.
4. Find your size using the chart, to the closest measurement.
US UK Inside Diameter (MM)
5 J 1/2 15.7 mm
6 L 1/2 16.5 mm
7 N 1/2 17.3 mm
8 P 1/2 18.1 mm
9 R 1/2 19 mm