Dremel 5/16-IN Tungston Carbide Cutter, 1/8" Shank Ideal for sharpening, deburring and general purpose grinding on most materialsincluding stainless steel. Specially designed for working with conic surfaces. Fast Cutting, Needle-Sharp Teeth For Greater Material Removal Minimum Loading Use On Fiberglass, Wood, Plastic, Epoxy And Rubber DO NOT RUN IN EXCESS OF 30,000 RPM