Multifunctional Cutter Bit: This Dremel accessory is ideal for engraving, carving, shaping, smoothing and material removal Materials: Use on hardened steel, stainless steel, cast iron, nonferrous metals, ceramics, plastics, hardwoods and other hard materials Strong: Made from Tungsten Carbide for use on hard materials Cutting diameter of 3.2 mm, Recommended maximum speed of 30,000 RPM Fits with all Dremel Multi-/Rotary tools or other 3,2mm shank size multi- / rotary tools