The document describes the HGM Ultrafine Mill for sale from Shanghai Clirik Machinery Co. LTD. The mill has a capacity of 0.5-30 tons per hour and can grind materials into powder between 5-74 microns. It works by crushing materials and then grinding them between rings and rollers into a fine powder collected by a dust filtration system. The mill offers high efficiency, long lifespan, safety, flexibility in particle size, and environmental friendliness.