Ring Stretcher Finger Wedding Band Resizer Tool Jewelry Sizing Tool Ring Stretcher Enlarger Expander Mandrel Wedding Band Sizer Jewelry Ring Sizing Tool Easily stretch and enlarge rings & bands SIZES 6.5" & UP Includes steel collet multi-stepped mandrel & a tapered pin expander Not for use on stone-set rings. Easy to use Wonder Ring Stretcher- Watch Video on how to Use. To Preserve and Prevent Oxidation a Light Coat of Oil is Applied.