US/CA

DIAMETER (MM)

SIZE 5 ----- 15.7 MM

SIZE 6 ----- 16.51 MM

SIZE 7 ----- 17.32 MM

SIZE 8 ----- 18.14 MM

SIZE 9 ----- 18.95 MM

SIZE 10 ----- 19.97 MM

SIZE 11 ----- 20.6 MM

SIZE 12 ----- 21.39 MM