【High Quality】: Our double-cut rotary files are made of heat-treated tungsten carbide, which is hard, strong, durable, heat-resistant and corrosion-resistant, wear-resistant, and not easy to break. 【Wide Range of Applications】: Suitable for wood and various metals (iron, carbon steel, alloy steel, stainless steel, copper, aluminum, etc.) and non-metallic materials (marble, jade, bone). This carbide burr set is widely used in DIY woodworking, carving, engraving, polishing, grinding, casting, chamfering, grooving, reaming, hollowing, cutting, jewelry making, etc. 【Double Cut Design】: With the double cut design, the groove lines of the head of these carving bits are crossed to produce smaller chips for faster cutting speeds and excellent control. The double grain design improves the cutting power and chip evacuation of the sharpening head, ensuring a smoother sharpening process with less clogging and overheating. 【High Working Efficiency】: The productivity of rotary burrs is dozens of