HRP Ring Size Guide

HRP Size Small Medium Large X Large
Internal Diameter (mm) 16.79 17.58 18.76 19.94
Internal Circumference (mm) 52.56 55.00 59.00 62.52
British UK M O R U
Europe 12.56 15 19.00 22.52
Japan 12 15 18 22
USA 6.25 7.25 8.75 10.25