#39 Carbide Bur.
Large Inverted Cone Bur - 1.8mm at widest point of cutting head.
The shank on this inverted cone is less tapered to withstand more engraving pressure when engraving hard surfaces.
Recommended and used by Calligraphy Engraver, Ken Brown to engrave on Wine Bottles, Jewelry, Perfume Bottles and much more.