All of our Metal Grinders are extra durable. This fine craftsmanship, will surly leave you with a grinder for life! Spinner Wheel Design 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 Spinner Wheel Design, this grinder has its own style. Metal Spinner Wheel Design grinders are considered a 2-piece grinder.