Stainless Steel Ring Mandrel 9-13 at Penn State Industries
Amazon.com: SE 13-Inch Polished Steel Ring Mandrel - Marked 1 to 16 US Sizes, Ungrooved, with Knurled Handle for Jewelry Making and Sizing - JT-SP2 : Arts, Crafts & Sewing
69-176-12 12" Steel Ring Mandrel, Grooved - Rings & Things
Expanding Ring Mandrel Stainless Steel (Large) | eBay
Stainless Steel Ring Mandrel Sizes 1-15: Wire Jewelry | Wire Wrap Tutorials | Jewelry Making Wire
PMC Precious Metal Clay Silver 255mm Ring Sizer Measuring Tool Aluminum Mandrel, with Japanese Sizes 3-27, for Jewelry Making | Goods Japan