Product Name: Tungsten Steel Alloy Rotary File Color: Silver Shipping Quantity: 1 set of 10 pieces Base material: tungsten alloy steel Function: grinding, engraving, deburring Applicable equipment: pneumatic/electric drive equipment Cogging distribution: double slot 1. Material: This tungsten carbide burr set is made of high quality tungsten carbide steel which has long service life. Rod diameter: 3 mm, cutting diameter: 6mm, please check the size before you buy. Used on wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals. Also, marble, jade, bone, etc. 2. Multi-Purpose: 1/8inch shank compatible with or most rotary tools. This rotary cutter kit contains everything you need to drill, engrave, sand, polish and remove sharp edges. It is suitable for wood, stone carving, metal work and dull sanding. 3. EXCELLENT WORKMANSHIP: Excellent for precision work, cutting, engraving, carving, touch-up and finishing. Smooth surface after carving or engraving, it can even process a variety of high-precision cavities. 4. These carbide burrs are typically used with an electric or pneumatic hand tool (can also be used in machine tools). The speed of electric or pneumatic tools is usually 6000-50000 revolutions per minute.