These 4-piece grinders include a very fine pollen screen that allow the smallest crystals to permeate.The sharp and powerful diamond-shaped teeth will grind up even a larger bud, while the pollen screen and kief catcher will filter and collect all the lovely bits that you can scrape out with the included spatula and save for re-use. The lid is magnetized to keep it securely in place. You'll get all the features of a large 4-part herb grinder at a fantastic price!