Size-Diameter Table
USA size 4 : Diameter .585" ITALIAN size 7 : Diameter 1,4 cm
USA size 5 : Diameter .618" ITALIAN size 10 : Diameter 1,5 cm
USA size 6 : Diameter .650" ITALIAN size 12 : Diameter 1,6 cm
USA size 7 : Diameter .683" ITALIAN size 14,5 : Diameter 1,65 cm
USA size 8 : Diameter .716" ITALIAN size 17 : Diameter 1,72 cm
USA size 9 : Diameter .748" ITALIAN size 19 : Diameter 1,82 cm