All of our Metal Grinders are extra durable. This fine craftsmanship, will surly leave you with a grinder for life! Handmuller 4-piece 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 design, this grinder has its own style. Handmuller Grinders are considered a 4-piece grinder.