There are two kinds of grit size, rough grid size and fine grit size. If the grit size bigger than 40μm normally call it rough grit size. If grit size less than 40μm normally called it fine grid size. We can also measure the grit size with microscope, use mark "W" and value to show the grit size, the value after the "W" is grit size, like W20 means really grit size is 20μm, here is detailed information below:
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