The Rasta Metalherb grinder features sharp precision teeth to shred herbs with ease, even when fresh. Ridges built into the lid push material back into the teeth for a perfect grind every time. A large screen allows for the herbs to stay on top while the crystals fall. Perfectly shaped holes allow more material to drop in easier. Use the grinder for storage while with a heavy-duty lid on tight to keep your ground herbs fresher longer.