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INTERNAL DIAMETER (MM) | US/CAN RING SIZE | UK/AUS RING SIZE | GERMAN RING SIZE |
14.1 |
3 | F | 14 |
14.9 | 4 | H | 15 |
15.7 | 5 | J | 153/4 |
16.5 | 6 | L | 161/2 |
17.3 | 7 | N | 171/4 |
18.1 | 8 | P | 18 |
19.0 | 9 | R | 19 |
19.8 | 10 | T | 20 |
20.6 | 11 | V | 20 3/4 |
21.4 | 12 | X | 21 1/4 |
22.2 | 13 | Z | 22 |