Cross-reference table of Hong Kong inch and hand inch (the ring number produced by our company is between 10-23)
Number diameter (mm) circumference (mm)
10 16. 1 50.5
1 1 16.6 52
12 16.9 53
13 17.0 53.5
14 17.7 55.5
15 18.0 56.5
16 18.2 57
17 18.3 57.5
18 18.5 58
19 18.8 59
20 19.4 6 1
2 1 19.7 62
22 20.2 63.5
23 20.4 64
Digital comparison table
(The data in this table is slightly different from the actual size for reference only)
Number of digits corresponding to the perimeter of American digits.
4 47 8
4.5 48 9
5.5 50 10
6 52 1 1
6.5 53 12
7 54 13
7.5 55 14
8 57 16
8.5 58 18
9 60 19
9.5 6 1 20
10 62 2 1
10.5 63 22
1 1 65 23
1 1.5 66 24