The grinding plates are made of a hard iron alloy designed for clog resistance and long life. Plate-to-plate clearance is easily adjusted by hand in order to change the mesh size range desired. Output capacity is up to 40lbs (18kg) per hour with dry material and the material hopper provides 50in3(820ml) approximately 2lb (0.9kg) of material. Grinding mill is sold with the dry grinding feeder and disk set— a wet grinding feeder and disk set is available as an accessory. The complete unit ships in two boxes.