Diameter correspondences:
7 = 54mm circumference
8 =circumference 56. 6mm
9 =circumference 59.1mm
10 =circumference 61.6mm
11 =circumference 64. 1mm
12 =circumference 66.6mm
13 =circumference 69. 1mm
The item is solid, reliable, and works as described. It has proven to be a valuable purchase and I’m very pleased.
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