All of our Metal Grinders are extra durable. This fine craftsmanship, will surly leave you with a grinder for life! Chain Design Metal Grinders are used to finely grind tobacco for smooth smoking and easy rolling. Tobacco is placed between the two halves and the grinder is repeatedly twisted. With a unique Chain design, this grinder has its own style. Metal Chain Design Grinders are considered a 3-piece grinder.