Grit numbers range from 24 (extra-coarse) all the way up to over 1000—though most home improvement projects use sandpaper in a much smaller range, from roughly 60- to 360-grit. It's a common ...

With fewer holes, larger particles make it through, and vice versa. So, for example, 36-grit sandpaper has just 36 holes in one square inch of the screen, which creates extra-coarse sandpaper.