The document discusses hydraulic impact crushers made by Joyal Crusher. It describes key features such as a heavy-duty rotor design, interchangeable wearing parts, easy maintenance, and flexible application for primary or secondary crushing. It provides technical specifications and diagrams for several PFW series models including the PFW 1210III, PFW 1214III, and PFW 1318III. The crushers can be used for coarse or fine crushing and provide customers with low costs and outstanding performance.