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HRP Ring Size Table

HRP Size Small Medium Large X Large
Internal Diameter (mm) 16.79 17.58 18.36 18.76
Internal Circumference (mm) 52.56 55.00 57.77 59.00
British UK M O Q R
Europe 12.56 15 17.77 19.00
Japan 12 15 17 18
USA 6.25 7.25 8.25 8.75