Utoolmart HSS Rotary Files, Double Cut Top Toothed Cylinder Shape Rotary Burrs ToolDescriptions* These burrs are made of high speed steel for high hardness, high abrasion resistance and high heat resistance. * Works with mostly small rotary tools for DIY carving fans.* Double cut design - The lines are crossed. Double groove rotary files are more suitable for the object density is relatively low, such as Wood, Plastic, AluminumSpecifications* Material: HSS (High Speed Steel)* Surface Treatment: Nickel Plating* Shank Diameter: Approx. 3mm / 0.12-inch* Cutting Edge Diameter: Approx. 3mm / 0.12-inch* Cutting Edge Length: Approx. 27mm / 1.06-inch* Total Length: Approx. 52mm / 2.05-inchPackage Content * 2 pcs x Rotary Burrs