| UK SIZE |
US SIZE |
DIAMETER (mm) |
| F |
3 |
14.05 |
| F 1/2 |
3 1/4 |
14.15 |
| G |
3 1/2 |
14.36 |
| G 1/2 |
3 3/4 |
14.56 |
| H |
4 |
14.65 |
| H 1/2 |
4 1/4 |
14.86 |
| I |
4 1/2 |
15.04 |
| I 1/2 |
4 3/4 |
15.27 |
| J |
5 |
15.4 |
| J 1/2 |
5 1/4 |
15.7 |
| K |
5 1/2 |
15.8 |
| K 1/2 |
5 3/4 |
16 |
| L |
6 |
16.1 |
| L 1/2 |
6 1/4 |
16.41 |
| M |
6 1/2 |
16.51 |
| M 1/2 |
6 3/4 |
16.71 |
| N |
7 |
16.92 |
| N 1/2 |
7 1/4 |
17.13 |
| O |
7 1/2 |
17.35 |
| O 1/2 |
7 3/4 |
17.45 |
| P |
8 |
17.75 |
| P 1/2 |
8 1/4 |
17.97 |
| Q |
8 1/2 |
18.19 |
| Q 1/2 |
8 3/4 |
18.35 |
| R |
9 |
18.61 |
| R 1/2 |
9 1/4 |
18.8 |
| S |
9 1/2 |
19.1 |
| S 1/2 |
9 3/4 |
19.31 |
| T |
10 |
19.51 |
| T 1/2 |
10 1/4 |
19.84 |
| U |
10 1/2 |
20.02 |
| U 1/2 |
10 3/4 |
20.2 |
| V |
11 |
20.32 |
| V 1/2 |
11 1/4 |
20.68 |
| W |
11 1/2 |
20.76 |
| W 1/2 |
11 3/4 |
20.94 |
| X |
12 |
21.18 |
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