【TUNGSTEN CARBIDE STEEL ROTARY BURRS SET】: These carbide rotary burrs are made of premium tungsten carbide steel, sharp, sturdy and durable. 【DOUBLE CUTTING DESIGN】: The groove lines of this carbide rotary burr head are crossed.It is used on wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade, bone, etc. Quickly ensuring cross grooves and chips during grinding and carving. 【HIGH WORKING EFFICIENCY】: The processing efficiency is dozens of times higher than the hand file tool, and nearly ten times higher than the small grinding wheel with handle.Generally, the rotary burr set can replace the small grinding wheel with handle.Easy to cut, safe and durable. 【LONG SERVICE LIFE】: Packed in a plastic case for safe storage and protection.The service life of these heavy duty rotary burrs is 10 times longer than high speed steel and 200 times longer than grinding wheel.The speed of rotary tools is generally 6000-50000 RPM, reducing inefficient rolling and extending the overall service life. 【WIDE APPLICATION】: 5pcs Double Edge Solid Carbide Rotary Burr Set compatible with most small rotary tools.Great choice for DIY, crafts, hobbies, home repairs, jewelry, lapidary use, modeling, and much more.