Usage - For hand use, just use it dry, but work faster and last longer when used with lubricant (water). Clean and dry the sanding pad after use. The flat surface ensures even and durable contact with tools, while oil stone and water stone are easily worn with uneven surface. Applications - The sanding block can be used for sharpening, trimming, grinding and polishing tiles, glass, marble, ceramic, concrete, stone, metal, jade, stamps and other materials. Notes - The smaller the mesh number, the rougher the polishing surface, the faster the polishing speed and the rougher the polishing effect. The larger the mesh number, the finer the polishing surface, the slower the polishing speed and the finer the polishing effect.