4 Piece Herb Grinder
4 piece herb grinder is three chambered style herb grinder. It consists of a lid, grinding chamber, collection chamber and kief chamber. In this herb grinder bottom of grinding chamber consists of holes for the grinded herbs to fall through into collection chamber. Unlikely 3 piece chamber, its collection chamber has a small mesh screen instead of solid bottom chamber. Under the collection chamber is the final piece: kief chamber. This grinder is called three pieces as because of lid, grinding chamber, collection chamber and kief chamber equals to three pieces.