This 2.2" 4-Piece Grinder contains dozens of sharp diamond teeth too finely grind any dry herbs. This grinder includes smaller and larger holes for an even grind. Rest assured now matter what you throw in this grinder these sharp teeth will never become dull. The middle chamber contains an extra fine screen to filter and collect excess pollen that comes from your dry herbs. In the bottom of the grinder there is a small plastic tool to help scrap that pollen out of the bottom chamber.