A two-piece grinder contains two pieces: the highest with teeth and the bottom to collect floor herb. A three-piece grinder adds a mesh screen involving the very best and base chambers to gather kief. A four-piece grinder contains yet another chamber beneath the kief catcher to keep gathered kief separately. https://jeffreycvlds.ltfblog.com/27743360/bong-cleaners-things-to-know-before-you-buy