DeGrey & Mason ring size table
| HRP Size | Small | Medium | Large | X Large |
| Internal Diameter (mm) | 16.5 | 17.3 | 18.1 | 19 |
| Internal Circumference (mm) | 52.00 | 54.00 | 57.00 | 59.00 |
| British UK | L/M | N/O | P/Q | R/S |
| Europe | 10 | 14 | 17.75 | 20.30 |
| USA | 6 | 7 | 8 | 9 |
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