Cut out a small vertical piece of paper

Apply the piece of paper on the finger where you will place Gloring and make a mark with the pen

Measure the piece of paper up to the mark with the pen

54 mm - 57 mm
57 mm - 60 mm
60 mm - 63 mm
63 mm - 66 mm
66 mm - 69 mm
69 mm - 72 mm
72 mm - 75 mm
75 mm - 78 mm

16.5
17.4
18.2
19
19.9
20.7
21.5
22.3

6
7
8
10
11
12
13