| Size |
Inside Diameter (mm) |
Inside Circumference (mm) |
| 1 |
12.5 |
39.3 |
| 1.5 |
12.9 |
40.5 |
| 2 |
13.3 |
41.8 |
| 2 1/2 |
13.8 |
43.4 |
| 3 |
14.2 |
44.6 |
| 3 1/2
|
14.6 |
45.9 |
| 4 |
15 |
47.1 |
| 4 1/2
|
15.4 |
48.4 |
| 5 |
15.8 |
49.6 |
| 5 1/2 |
16.2 |
50.9 |
| 6 |
16.6 |
52.2 |
| 6 1/2 |
17 |
53.4 |
| 7 |
17.4 |
54.7 |
| 7 1/2 |
17.9 |
56.2 |
| 8 |
18.3 |
57.5 |
| 8 1/2 |
18.7 |
58.7 |
| 9 |
19.1 |
60.0 |
| 9 1/2 |
19.5 |
61.3 |
| 10 |
19.9 |
62.5 |
| 10 1/2 |
20.3 |
63.8 |
| 11 |
20.7 |
65.0 |
| 11 1/2 |
21.1 |
66.3 |
| 12 |
21.5 |
67.5 |
| 12 1/2 |
21.9 |
68.8 |
| 13 |
22.3 |
70.1 |
|
