18 Ligne = 7/16″ dia. = 11.5 MM

20 Ligne = 1/2″ dia. = 12.700 MM

24 Ligne = 5/8″ dia. = 15 MM

30 Ligne = 3/4″ dia. = 19.050 MM

32 Ligne = 13/16″ dia. = 20 MM

34 Ligne = 7/8″ dia. = 21 MM

36 Ligne = 15/16″ dia. = 23 MM

40 Ligne = 1″ dia. = 25.400 MM

45 Ligne = 1-1/8″ dia. = 28.58 MM