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Size Chart

 US Size  Inside Diameter Inside Circumference UK Size
5 15.6mm 49.3mm J 1/2
6 16.45mm 51.9mm M
7 17.3mm 54.4mm O
8 18.2mm 57.0mm Q
9 19.0mm 59.5mm R 1/2
10 19.84mm 62.0mm T 1/2