Invisible Ring Sizer Adjusters, Rings Guards &Spacers for Loose Rings, Tightener
XS -2.0mm Fit 0.03-0.08in (0.8-2.0mm) width rings. S -3.0mm Fit 0.08-0.12in (2.0-3.0mm) width rings. M - 4.0mm Fit 0.1-0.16in (2.5-4.0 mm) width rings. L - 5.0mm Fit 0.14-0.20in (3.5-5.0 mm) width rings.