Dremel 590-1 Engraver and Engraving Tips - Dremel 26159929JA, A Diamond Engraving Point for use with the Dremel Engraver 290, (85-0469).
The Diamond Engraving Point 9929 has a longer lifespan than the Carbide Point and is for use on harder materials such as glass.
Dremel 26159929JA 9929 Engraver Diamond Engraving Tip