HRP Ring Size Table

HRP Size X-Small Small Medium Large
Internal Diameter (mm) 16.00 16.4 16.79 17.58
Internal Circumference (mm) 50.27 51.30 52.56 55.00
British UK K L M O
Europe 10.27 11.30 12.56 15
Japan 10 11 12 15
USA 5.5 6 6.25 7.25