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| Local Size (SG/MY) | Inner Diam. (mm) | US / Canada | UK / Australia |
|---|---|---|---|
| 8 | 14.8 | 4 | H |
| 9 | 15.1 | 4.5 | I |
| 10 | 15.4 | 4.75 | J |
| 11 | 15.8 | 5 | J 1/2 |
| 12 | 16.1 | 5.5 | K 1/2 |
| 13 | 16.5 | 6 | L 1/2 |
| 14 | 16.8 | 6.25 | M |
| 15 | 17.2 | 6.75 | N |
| 16 | 17.5 | 7 | O |
| 17 | 17.9 | 7.5 | P |
| 18 | 18.2 | 8 | Q |
| 19 | 18.6 | 8.5 | R |
| 20 | 18.9 | 9 | S |
| 21 | 19.3 | 9.5 | T |
| 22 | 19.7 | 10 | T 1/2 |
| 23 | 20.0 | 10.5 | U 1/2 |
| 24 | 20.4 | 11 | V 1/2 |