The “absolute best” stones for fine finishing of non-precious and semi-precious ceramic metals.
“Non-contaminating & long-lasting”.  (aluminum oxide) 
| Abrasive | Aluminum Oxide | 
| Action | Finish | 
| Color | Rubi | 
| Compare to | Shofu | 
| Dremel Code | Grinding/Sharpening | 
| For use on | Non-Precious Metal | 
| For use on | Semi-Precious Metal | 
| Format | 138 | 
| Shank Diameter | 3/32" (2.35mm) | 
| Shank Type | HP | 
| Shape | CN1 | 
| Specialty | Dental | 
| Tool | Rotary Tool | 
| Tool | MOTO-TOOL | 
| UPC | 792818348237 |