Feature 1The alloy grinder has a doubleslot design, ultrafast chip removal, and it is not easy to block the lines when grinding and engraving. 2The cemented carbide file has high hardness and good toughness. After rustproof treatment, it has a beautiful texture and is not easy to rust. 3The file is made of hard tungsten steel bar, which has high rigidity and strong wear resistance, so that the service life of the tool is longer. 4The product has a wide range of applications, and can be used for mold processing and manufacturing, mechanical chamfering, and cleaning of cast, forged, and welded flashes, etc. 5If you encounter any problems in use, please contact us in time and we will solve it for you in time. Item Type: Carving Burr BitsMaterial: Tungsten SteelProduct Size: D3 x 38mmProduct Quantity: 20pcsCogging Distribution: Double Bowl Package List 20 x Carving Burr BitsNote1. This product has a wide range of uses. It can be used for mold processing and manufacturing, mechanical chamfering, rounding, bevel processing, flash, burr and weld cleaning of castings, forgings, weldments, and arts and crafts engraving of metal and nonmetal materials.2. Carbide rotary file (tungsten steel grinding head) is mainly used with electric tools or pneumatic tools (also can be installed on machine tools), and the matching driving speed is generally 600050000 rpm.3. The double bowl is more suitable for materials with relatively low density due to the intersect pattern. Proportion: wood, aluminum and other materials. The chip with intersect pattern is fast, and it is not easy to block the pattern when grinding and engraving, soft objects are more suitable for doublebowl rotary files.4. Single bowl is more suitable for harder materials, because chips can easily block the knife bowl during cutting.