Size Chart Diameter

Australian/UK Inside Diameter (mm)

F

 14.1
G 14.4
H 14.8
I 15.2
J 15.6
K 16
L 16.4
M 16.8
N 17.2
O 17.6
P 18
Q 18.4
R 18.8
S 19.2
T 19.6
U 20
V 20.4
W 20.8
X 21.2
Y 21.6
Z 22