Metrix G5 4-Layer Steel Grinder used for shredding dry herb. The 4 layers consist of the grinding teeth, course screen, fine screen, and keif catcher. Heavy duty steel constructions makes quick work of shredding all flower. The G5 include a very special feature. The fine screen layer includes small windows to keep tack of what you've collected. Elegant polished steel finish. Includes a small plastic tool for easily handling keif.