Dremel 9901 Cutter, 1/8 in Dia, 1-1/2 in L, Tungsten Carb...

Shapes, smoothes or grinds especially hard materials such as hardened steel, stainless steel, cast iron, non-ferrous metals, fired ceramics, plastics and hard woods. Do not run in excess of 30,000 rpm.

• A high-speed cutter made of tungsten carbide, the hardest material next to diamond
• Use higher speeds for hard woods, slower speeds for metals and very slow speeds for plastics
• Use the sides of the cutter rather than the tip for effective cutting

• Catalog https://assets.unilogcorp.com/187/ITEM/DOC/DREMEL_100001675_Catalog.pdf