1. Doublesided Sharpening Stone for Edge Honing: This sharpening stone features a doublesided design, with one side made of 3000 grit ruby oilstone and the other side of 10000 grit natural agate oilstone. It is ideal for grinding and fine honing various tools, including steel, alloy steel, precision measuring tools, and instrument parts. 2. Quality Materials: Crafted from materials, this sharpening stone is sintered at temperatures, ensuring exceptional hardness and durability. The ruby oilstone is rosered with a fine, compact structure, offering nearly wear performance and hardness. The natural agate oilstone has an ultrafine, uniform texture, hardness, and outstanding wear resistance. 3. Easy to Use: Simply add a few drops of water to the stone before use. The raised edge provides an extremely sharp finish, delivering precise and refined results for your tools. 4. Wide Range of Applications: This sharpening stone is widely used in the jade and instrument industries, as well as for precision parts, gemstones, measuring tools, instruments, hard alloys, and more. It is specially designed for fine polishing and achieving a finish on various materials.