Grinding and Sharpening: In metalworking, sandpaper is often used for grinding and sharpening many steel resources and surfaces. Coarser grits, like 36 or 60, are used to get rid of material and shape the steel. This is very useful for reshaping or sharpening blades, chisels, or other cutting resources. HowtoFindRocks.com https://x.com/Anumhsite/status/1809236065666081159