This machine is of laboratory dry, wet grinding machine, compact structure, novel, simple transmission less, rollers, convenient operation, safe and reliable. For metallurgy, building materials, chemical industry and coal geology, experimental research units and ore dressing plant of ore dressing or for other industries as fine a few materials in. Rod mill, grinding particle size more uniform composition, crushing phenomenon of smaller, higher efficiency and. It is an ideal equipment for fine grinding of gold sample. This product is the only designated former Ministry of Geology and mineral production, the implementation of industry standards.