Fit
Find your size.
A ring that files has to stay on. Match a credit card to the rectangle, then pick the circle that matches a ring you already wear — or measure a diameter / a string.
Hold a real credit or debit card on the screen. Drag the slider until the gray rectangle matches it exactly. Then drop a ring you own on the circles.
Standard card · 85.60 × 53.98 mm
US → mm
Using US 9 · 18.91 mm inside
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