Midea 8 diameter 1.82cm-Method 2 Appropriate inner wall diameter at the inner wall of the ring

The diameter of the U.S. 5 is 1.57cm-Method 2 Africa inner wall diameter at the inner wall of the ring

The diameter of the U.S. 6 is 1.65cm-Method 2 Appropriate Ring's inner wall diameter

Midea 7 diameter 1.73cm-Method 2 Appropriate ring diameter in the inner wall of the ring