Dremel 3/32" Diameter Tungsten Carbide Cutter with 1" Shank is a high-speed cutter made of tungsten carbide, the hardest material next to diamonds. It is ideal for shaping, smoothing or removing material from especially hard materials including hardened steel, stainless steel, cast iron, nonferrous metals, fired ceramics, and especially hard plastics. 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.