Grinding And Sharpening: In metalworking, sandpaper is often used for grinding and sharpening different metallic applications and surfaces. Coarser grits, like 36 or 60, are used to get rid of material and form the steel. This is very helpful for reshaping or sharpening blades, chisels, or other cutting equipment. Sandpaper https://x.com/hongyuxin20/status/1818167892640141323