Misura Anelli

Diameter(mm)

Italy

Usa

French/German

UK

15.9

10

5

50

J 1/2

16.7

12.5

6

52.5

L 1/2

17.5

15

7

55

N 1/2

18.3

17.25

8

57.25

P 1/2

19.1

20

9

60

R 1/2