Rings

US Inside circumference (mm) Inside circumference (inches)
5 49.3 1.90
5.5 50.6 2.00
6 51.9 2.05
6.5 53.1 2.10
7 54.4 2.15
7.5 55.7 2.20
8 57.0 2.25
8.5 58.3 2.30
9 59.5 2.35
9.5 60.8 2.40
10 62.1 2.46
10.5 63.4 2.51
11 64.6 2.56
11.5 65.9 2.61
12 67.2 2.63
12.5 68.5 2.71
13 69.7 2.76