Size guide
| Ring Diameter (Inside) | Ring Circumference (Inside) | ‹ International Standard Sizes › | |||||||
| MM | Inches | MM | Inches | Britan & Australia | USA & Canada | Europe | German Russian Asia | India China Japan | Netherlands Swiss |
| 9.9 | 0.390 | 31.1 | 1.22 | · | 0000 | · | · | · | · |
| 10.7 | 0.442 | 33.7 | 1.39 | · | 00 | · | · | · | · |
| 11.5 | 0.454 | 36.2 | 1.43 | · | 0 | · | · | · | · |
| 12.0 | 0.470 | 37.5 | 1.50 | A | 1/2 | · | · | · | · |
| 12.2 | 0.479 | 38.3 | 1.51 | A 1/2 | 3/4 | · | · | · | · |
| 12.4 | 0.487 | 38.9 | 1.53 | B | 1 | · | · | 1 | · |
| 12.6 | 0.506 | 39.6 | 1.56 | B 1/2 | 1 1/4 | · | · | · | · |
| 12.8 | 0.503 | 40.2 | 1.58 | C | 1 1/2 | · | · | · | · |
| 13.0 | 0.511 | 40.8 | 1.61 | C 1/2 | 1 3/4 | · | · | · | · |
| 13.2 | 0.520 | 41.5 | 1.63 | D | 2 | 41 1/2 | 13 1/2 | 2 | 1 1/2 |
| 13.4 | 0.528 | 42.1 | 1.66 | D 1/2 | 2 1/4 | · | · | · | · |
| 13.6 | 0.536 | 42.8 | 1.68 | E | 2 1/2 | 42 3/4 | 13 3/4 | 3 | 2 3/4 |
| 13.8 | 0.544 | 43.5 | 1.71 | E 1/2 | 2 3/4 | · | · | · | · |
| 14.0 | 0.553 | 44.1 | 1.74 | F | 3 | 44 | 14 | 4 | 4 |
| 14.2 | 0.557 | 44.5 | 1.75 | F 1/2 | 3 1/8 | · | · | · | · |
| 14.3 | 0.561 | 44.8 | 1.76 | F 3/4 | 3 1/4 | · | · | · | · |
| 14.4 | 0.565 | 45.1 | 1.77 | G | 3 3/8 | 45 1/4 | · | 5 | 5 1/4 |
| 14.5 | 0.568 | 45.4 | 1.79 | G 1/4 | 3 1/2 | · | 14 1/2 | · | · |
| 14.6 | 0.573 | 45.7 | 1.80 | G 1/2 | 3 5/8 | · | · | 6 | · |
| 14.7 | 0.576 | 46.0 | 1.81 | H | 3 3/4 | 46 1/2 | · | · | 6 1/2 |
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