This Review Title is All four sides are course grit and the content is: My error in not reviewing the full detail.  If you only need a course grit, this is for you.  It scratched my nail, of which you can see through the polish.  I returned for a block that had four separate grits on each side..There are other information for this review, one is This reviewer did purchase it and the other is 0 people think this review is helpful.