【TUNGSTEN CARBIDE STEEL ROTARY BURS SET】: These carbide rotary burrs are made of premium tungsten carbide steel, sharp, sturdy and durable. Total length: 45-50mm, cutting diameter: 6.35mm, shank length: 35mm, shank diameter: 3.25mm, compatible with most rotary tools and die grinders. 【DOUBLE CUT DESIGN】: The grooves 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. It quickly ensures the removal of crossed grooves and chips when grinding and carving. 【HIGH WORKING EFFICIENCY】: The processing efficiency is dozens of times higher than that of a hand file and nearly ten times higher than that of a small handle grinding wheel. Generally, the rotary burr set can replace the small handle grinding wheel. 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