ANVI/US SIZE Circumference(mm) Circumference(in)
2 41.5 1.63
3 44.2 1.74
4 46.7 1.84
5 49.3 1.94
6 51.9 2.04
7 54.5 2.15
8 57.2 2.25
9 59.4 2.35
10 62.3 2.45

 

INTERNAL DIAMETER ANVI/US SIZE JAPAN SIZE UK SIZE
13.3mm 2 2 D
14.1mm 3 4 F
14.9mm 4 7 H
15.7mm 5 9 J
16.5mm 6 12 L
17.3mm 7 14 N
18.1mm 8 16 P
19.0mm 9 18 R
19.8mm 10 20 T

*If you still have problem with your size, please contact us.