Size(US) Perimeter(mm) Diameter(mm)
5 49 15.6
5.5 49.95 15.9
6 52 16.4
6.5 52.46 16.7
7 54.5 17.3
7.5 56.23 17.9
8 57 18.1
8.5 58.75 18.7
9 59.5 18.9
9.5 61.26 19.5
10 62 19.7
10.5 63.77 20.3
11 64.5 20.6
11.5 66.29 21.1
12 67.5 21.4