1Premium Material: Rotary file is made of cemented carbide material, rustproof, high strength, sturdy and durable, has a high hardness at 1000. 2Excellent Performance: Carbide rotary burr has good wear resistance, high toughness, heat resistance, remains unchanged even at 500. 3Efficient: Double cut carbide rotary burr has high efficiency, professional manufacturing, exquisite workmanship, has a long service time. 4Simple Operation: Carbide rotary file is easy to grasp and convenient for using, safe and reliable, a necessary tool for professionals and amateurs. 5Multipurpose: Carbide burr is widely used in machinery, aviation, automobile, ship and so on, suitable for metalwork, tool making, engineering, etc.