Ring sizes:
measures 7, 15 mm diameter
measures 8, 15.3 mm diameter
measures 9, 15.6 mm diameter
measures 10, 15.9 mm diameter
measures 11, 16.2 mm diameter
measures 12, 16.5 mm diameter
measures 13, 16.8 mm diameter
measures 14, 17.2 mm diameter
measures 15, 17.5 mm diameter
measures 16, 17.8 mm diameter
measures 17, 18.1 mm diameter
measures 18, 18.4 mm diameter
measures 19, 18.7 mm diameter
measures 20, 19.1 mm diameter
measures 21, 19.4 mm diameter
measures 22, 19.7 mm diameter
measures 23, 20 mm diameter
measures 24, 20.3 mm diameter
measures 25, 20.7 mm diameter
measures 26, 21 mm diameter
measures 27, 21.3 mm diameter
measures 28, 21.6 mm diameter
measure 29, 22 mm diameter
measures 30, 22.3 mm diameter