Made of premium aluminum, every Diamond Grind offers you a high-quality grinding experience every time you use it. Each grinder is milled from a solid block of 6061 aircraft grade aluminum to guarantee that you get the best grinder possible that will resist wear and tear over time. Convenient, easy to use, and fits the perfect amount of herbs, each grinder features diamond-shaped teeth to give your herbs the perfect cut. These 4-piece grinders fit comfortably in your hand and each grinder features useful features such as high-quality diamond-shaped teeth, sifting mesh screen, and a storage compartment to give you the exact grind that you are needing for your herbs and spices. Every Diamond Grind comes with a lifetime manufacturers warranty so you can rest easy knowing you and your favorite legal smoking herbs are in good hands with Diamond Grind.