12 pcs. Grinding Head 3mm Shank 4.8mm Chainsaw Sharpening Burr Wear-resistant Emery Grinding Stone Feature:1. 12pcs One Set: This set includes 12pcs emery grinding head for your use or old or broken2. Standard size: the size of this chainsaw sharpening stone is standard, it can match with electric grinder and electric drill3. Portable: This emery grindstone is small and easy to carry, which is convenient for outdoor use4. Emery material: the grinding head is made of full and high-quality emery, the upper is carbonized, which is durable and wear-resistant5. Wide range of application: these grinding heads are mainly used for chain grinding, suitable for small chainsawsSpecification:Item Type: Grinding HeadMaterial: EmerySuitable Tool: Electric Grinder, Electric Drill and Other Power ToolsShank Diameter: About 3mm/0.1inSanding Head Diameter: Approx.4.8mm/0.2inSuitable for: Small Chainsaw, For 325 Chain, 3/8 Large ChainPackage List:12 x Grinding Head