Size of buttons is often labelled in so called English Ligne (L or '). One English Ligne is 1/40 of English inch. Exactly 0,635 mm.
Eng. ligne | mm |
6" | 3,81 |
8" | 5,08 |
10" | 6,35 |
12" | 7,62 |
14" | 8,89 |
16" | 10,16 |
18" | 11,43 |
20" | 12,7 |
22" | 13,97 |
24" | 15,24 |
26" | 16,51 |
28" | 17,78 |
30" | 19,05 |
32" | 20,32 |
34" | 21,59 |
36" | 22,86 |
38" | 24,13 |
40" | 25,4 |
42" | 26,67 |
44" | 27,94 |
46" | 29,21 |
48" | 30,48 |
50" | 31,75 |
52" | 33,02 |
54" | 34,29 |
56" | 35,56 |
58" | 36,83 |
60" | 38,1 |