Some sharpening stones have different grits. The grit is the measure of the coarseness of a sharpening stone. The higher the grit, the less coarse it is. The coarser it is, the more metal it rubs off in a pass. Since sharpener blades are tiny, I suggest sharpening stones with a finer surface. They should have a higher grit.http://www.tianhongstationery.com/electric-eraser/
Like
Comment
Share
