Dremel 1/8" Diameter Tungsten Carbide Cutter with 1/8" Shank is used for shaping, smoothing, and material removal on a variety of surfaces. Made from carbide, the next hardest material to diamonds, this cutter is extremely durable and can withstand high temperatures. It can be used on hardened steel, stainless steel, cast iron, non-ferrous metals, fired ceramics, plastics, hardwoods, and other hard materials. Do not run in excess of 35,000 RPM.