Thingiverse

Chainmaille Ring Sizer Tool (Outside Diameter) by Stoutlimb
by Thingiverse
Last crawled date: 4 years, 3 months ago
While working with various ring sizes, I've often picked up a ring and wondered what size it is. This solves the problem without the need for calipers or a ruler. Measurements are in inches and millimetres, so conversion can also be done. This particular ring sizer measures outside diameter. (OD)
You can find the one that measures inside diameter here:http://www.thingiverse.com/thing:852513
You can find the one that measures inside diameter here:http://www.thingiverse.com/thing:852513