1SAFELY STORED AND PROTECTED: The whole piece is made of heat treated solid tungsten carbide with long service life. Equipped with a beautifully packaged plastic case, which can be safely stored and protected 2USE WITH HANDHELD ELECTRIC OR PNEUMATIC TOOLS: Generally used with handheld electric or pneumatic tools, and can also be used for machine tools 31 or 8IN HANDLE: 20 pieces solid carbide rotating burr kit have 1 or 8in handle(3mm), suitable for Dremel and most small rotating tools 4SINGLE AND DOUBLE PATTERN: The package contain tungsten carbide burr with single and double pattern design to meet a variety of work needs 5SMOOTH CHIP REMOVAL: Rotary file drill bit set come with high working efficiency and smooth chip removal, very practical Item Type: Tungsten Carbide Burr SetTotal Length: Approx. 38mm or 1.5inMaterial: Tungsten steelFile Pattern: Single, double patternCutting Diameter: 1 or 8in(3mm)Shank Diameter: 1 or 8in(3mm) Package List 20 x Tungsten Carbide Burr Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.