Dremel Tungsten Carbide Cutter #9903 Dremel AccessoriesShapes, smooths or grinds especially hard materials including: hardened steel, stainless steel, cast iron, nonferrous metals, fired ceramics, plastics and hard woods A high speed bit made of tungsten carbide, the hardest material next to diamonds Use higher speeds for hard woods, slower speeds for metals and very slow speeds for plastics Use the sides of the bit (rather than the tip) for effective cutting Shank Diameter: 1 8" Bit Diameter: 1 8" (3. 2