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Description
This compact set of ring stretcher mandrels lets you enlarge and size rings with controlled pressure, whether you are at the bench or working on the go. Clamp the mandrel securely, snug the ring down with the center bolt, and the metal eases out smoothly into its new size.
Features
- Set of three expanding ring stretcher mandrels covering small, medium, and large ring size ranges.
- Compact design stores easily in a drawer or tool roll and is suitable for mobile or small workshops.
- Can be secured in a vise or clamp, or used with a lathe/polisher for controlled, powered stretching.
- Center bolt expansion tightened with the included hex key for even ring enlargement.
- Supports both sizing adjustments and gentle reshaping of out-of-round rings.
- Designed to complement Durston’s ring stretcher/reducer tools and general ring sizing workflow.
Specifications
| Detail | Value |
|---|---|
| Small Diameter Range | 14–17 mm (approx. 0.55–0.67") |
| Medium Diameter Range | 17.5–20.5 mm (approx. 0.69–0.81") |
| Large Diameter Range | 21–24 mm (approx. 0.83–0.94") |
| Total Length (each mandrel) | 92 mm (approx. 3.62") |
| Set Type | Expanding ring stretcher mandrels (small, medium, large) |
| Brand | Durston |
What's Included
| Item | Description | Qty |
|---|---|---|
| Ring stretcher mandrel – small | Expanding mandrel for smaller ring sizes | 1 |
| Ring stretcher mandrel – medium | Expanding mandrel for mid-range ring sizes | 1 |
| Ring stretcher mandrel – large | Expanding mandrel for larger ring sizes | 1 |
| Hex key | For tightening the center bolt to expand the mandrels | 1 |
Compatibility
Secure each mandrel in a bench vise, clamp, or suitable holder, or use with an appropriate lathe/polisher according to your workshop setup.
Notes
Place the ring over the appropriate mandrel, then tighten the center bolt gradually to stretch the ring. Work slowly and check the size frequently to avoid over-stretching, especially on soldered or stone-set rings.
California Prop 65 Warning:Cancer and Reproductive Harm. www.P65warnings.ca.gov.
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