Round steel ring mandrels with laser-engraved sizes. USA style is graduated in sizes 1-16 by 1/4-size increments.
- Hardened and polished high grade steel
- Calibrated to ISO specifications
- Accurate within +/- 1.5μm
- US Sizes 1-16
- Packaged in protective reusable case
**NEW & IMPROVED U.S. MADE**
ACCURATE TO ISO 8653: 1986 INTERNATIONAL STANDARDS FOR RING SIZE