Ring Size Conversion, US to International Ring Sizes
KW-trio 12pcs DIY Disc Binding Ring T-type Mushroom Hole Loose Notebook Notepad Binder Fixing Disc Buckle 10mm/15mm/20mm/25mm for Travel Office Home School Students - Walmart.com
Saw Blade Bushing Set Saw Blade Adapter Ring, 1 Inch to 20 mm, 1 Inch to 5/8 Inch, 7/8 Inch to 5/8 Inch, 7/8 Inch to 20 mm,20 mmto 5/8 Inch, 5/8
Ring Sizes - the Museum of Small Things
Ring Size Guide | Olivia Ewing
Ring Size Guide Millimeters
Amazon.com: uxcell Nitrile Rubber O-Rings, 20mm OD 15mm ID 2.5mm Width, Metric Buna-N Sealing Gasket, Pack of 10 : Industrial & Scientific