All of our Mini-Metal Grinders are extra durable. This fine craftsmanship, will surly leave you with a grinder for life! Mini-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 design, this Mini-Metal Grinders has its own style and is easily concealed . Mini-Metal Grinders are considered a 3-piece grinder.