The size distribution of the product is influenced mainly by the open and closed side settings of the crusher. The discharge opening of a jaw crusher is commonly listed in terms of the closed side set. Closed side sets can range from 19 mm (0.75 in) up to 711 mm (28 in). Crusher sets can be changed on-site, either manually or automatically, usually in order to compensate for jaw liner wear (King, 2001). The capacity of a jaw crusher is function of the feed size and the settings of the crusher. Crusher manufacturers typically produce capacity tables for their various sized machines in terms of the closed side set (Table 2.1).