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[Fine Workmanship]: Grinding head diameter is about 3mm, shaft diameter 3mm, length 43mm, abrasive grains won’t come off easily, high hardness. [Practical Tool]: Stone grinding head can be used to replace you worn or broken grinding head, fits for chainsaw grinder or other rotating tool. [High Hardness]: Burr stone file has high hardness and can be used for metal polishing, especially for steel parts after heat treatment. It is an ideal tool for grinding electric saws, and it is even more labor-saving than traditional grinding tool. [Wide Application]: Diamond chainsaw sharpener accessories can quickly remove burrs on the surface of the object, and polish and polish the surface of the product. They can be applied to wood, metal, glass and jewelry. [Package]: Package includes 20pcs Rotary Grinding Stones Drill Bit.