Compare to Dremel 9910 - 1/8 inch CONE Tungsten Carbide Cutter. Identical to Dremel 9910 but not in retail packaging. Tungsten Carbide Cutters are ideal for shaping, smoothing or removing material from especially hard materials. Shapes, smoothes or grinds especially hard materials including: hardened steel, stainless steel, cast iron, nonferrous metals, fired ceramics, plastics and hard woods. A high-speed cutter made of tungsten carbide, the hardest material next to diamonds. For use in Dremel rotary tools. 1/8 inch shank. For longer life, use with a cooling agent such as Eurotool Cut Lube.