Expanding stainless steel ring mandrel for lathe and wood rings – Ringsupplies.com
Ring mandrel, hardened steel and plastic, black and red, 12x1 inches with groove and case. Sold individually. - Fire Mountain Gems and Beads
Pro Ring Mandrel - Rockler
Stainless Steel Ring Mandrel 9-13 at Penn State Industries
Expanding Stainless Steel Ring Mandrel with Hex Allen Key - Heavy Duty Ring Shaper Tool for Ring Turning and Ring Making ( Ring Sizes 7.5-10.5 ) - Walmart.com
Polished Chrome Steel Ring Mandrel sizes 1-15 for Ring Repair Ring sizing and Jewelry Making