【Tungsten Carbide Steel Rotary Burr Set】: These carbide rotary burrs are made of high-quality materials. Made of high-quality tungsten carbide steel, they are sharp, sturdy and durable. Total length: 45-50mm, cutting diameter 1/4 inch, shank length 35mm, shank diameter 1/8 inch, compatible with most rotary tools and grinders. 【Double-cut Design】: The groove lines on the head of this carbide rotary burr 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 create cross grooves and chips when grinding and carving. 【HIGH EFFICIENCY】: Efficiency in difficult work; dozens of times higher than that of the hand file and almost ten times higher than that of the small abrasive wheel with handle. In general, the burr set can replace the small abrasive wheel with handle. Easy to use, safe and durable. 【LONG LIFE】: Packed in a plastic case for safe storage and protection. The life of these