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30 Pieces burr grinding stone file with a storage box, polishing grinding tool grinding bits for chainsaw sharpener, 5/32 inch/ 4 mm Features: Simple to operate: The grinding bit for chainsaw sharpener is easy to install and features good heat-dissipation, you can apply it to polish without disassembling the chain, which can improve work efficiency. Wide applications: Mainly applied for machinery, bearing, mold, casting parts deep hole, different internal surface, welding spot, welding seam grinding and burr grinding. Specifications: Material: emery grain Size: Grinding head diameter: approx. 4 mm in diameter Grinding head length: approx. 24 mm Shank diameter: approx. 3 mm Total length: approx. 46 mm Package includes: 30 x Burr grinding stone file 1 x Storage box Note: Please keep away from kids. Please allow slight errors on size due to manual measurement.