The Tsunami Dry Herb Grinder is a premium, heavy-duty 4-piece metal grinder recognized for its distinct concave (sunken) lid design that naturally forces flower into the grinding teeth for a faster, highly efficient shred. Machined with a sleek chromium finish, these durable units feature razor-sharp, diamond-cut teeth that deliver a fluffy consistency while filtering fine pollen through a mesh screen into a dedicated bottom kief chamber.