UK Size US Size EU Size Diameter
H 4 46 1/2 14.9mm
I 4 1/2 47 3/4 15.2mm
J 4 3/4 49 1/2 15.7mm
K 5 1/4 50 1/4 16.1mm
L 5 3/4 51 1/2 16.4mm
M 6 1/4 52 1/2 16.8mm
N 6 3/4 54 17.2mm
O 7 1/4 55 1/4 17.6mm
P 7 3/4 56 1/4 18mm
Q 8 1/4 57 1/2 18.4mm
R 8 3/4 58 1/2 18.7mm
S 9 1/4 60 1/4 19.1mm
T 9 3/4 61 1/2 19.5mm
U 10 1/4 62 1/2 19.9mm
V 10 3/4 63 3/4 20.3mm