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 |