Dremel 5/16" Diameter High Speed Steel Engraving Cutter with 1/8" Shank is a versatile, high-quality cutter made of high-grade steel for use on wood, plastic and soft metals. It is ideal for shaping, hollowing, grooving, slotting, inlaying and making tapered holes in soft metals, plastics and woods especially on curved surfaces. Do not use in excess of 35,000 RPM. Dremel accessories are truly among the finest products to maximize your woodworking experience. Built on a foundation of technology and innovation, Dremel accessories always deliver the most professional results.