The Dremel 125 High Speed Cutter is the largest triangular cutter made of high-quality steel for use on softer materials like wood, plastic, and soft metals like aluminum, copper, and brass. High-speed cutters work well for material removal in applications like molding, carving, engraving, hollowing, slotting, grooving, inlaying, making tapered holes, or freehand routing. Less aggressive, more frequent passes will always produce better results than pushing too hard or forcing the tool through the material.