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The usefulness of a grinder is to crush the grass without having to do it with your hands. There are different types of grinders, the simple ones you put the dry grass and crush it, with different floors, the two-level ones have holes and a sieve glued, so you recover the grass on the first floor and the pollen on the second. Or three stories, you put the dry grass, crush, recover the grass on the sieve, and on the third sieve you recover the pollen that extracts the bud. In this section you will find simple grinders, metal grinders of iron or aluminum, 1, 2 or 3 floors, electric grinders.