Burr grinding stone file with high strength can quickly and effectively polish chainsaw, keeping the chainsaw as sharp as ever. Thanks to the emery grains with good wear and impact resistance on the surface of burr grinding stone file, it can be used for a long period of time. Made of high-quality emery material, the burr grinding stone files are strong and durable to use. There are 3 sizes: 4mm, 4.8mm, 5.5mm for you to choose, and their length is 45mm, shank diameter is 3mm. Grinding head diameter of 4mm is 18.5mm long, and diameter of 4.8mm, 5.5mm is 22mm long. They are is suitable for polishing chainsaw, jade, metal, stone carving, mold, steel, hard alloy, etc. Item Name: Burr Grinding Stone Files Material: Emery Color: Golden, Silver Shank Type: Round Shank Specifications: 4mm, 4.8mm, 5.5mm Features: Wide Applications, High Hardness, Fast Grinding Size Details: Grinding Head Diameter: 4mm/0.16", 4.8mm/0.19", 5.5mm/0.22" (Approx.) Grinding Head Length: 4mm: 18.5mm/0.73", 4.8mm, 5.5mm: 22mm/0.87" (Approx.) Length: 45mm/1.77" (Approx.) Shank Diameter: 3mm/0.12" (Approx.) Notes: Electric chain saws generally choose a diameter of 4.0mm. Small chain saws generally choose diameter 4.8mm. Large chain saws generally choose a diameter of 5.5mm. 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. Package Includes: 5 x Burr Grinding Stone Files