The size of a jaw crusher is usually expressed as gape x width. The common crusher types, sizes and their performance is summarized in Table 1.1.Currently, the dimension of the largest Blake-type jaw crusher in use is 1600 mm x 2514 mm with motor ratings of 250-300 kW. Crushers of this size are manufactured by Locomo and others. The crusher is the GK series having dimensions 1600 x 2000 mm. driven by 400 kW motors. Various sizes of jaw crushers are available, even a crusher size of 160 x 2150 mm (1650 mm is the width of the maximum opening at the top and the jaws are 2150 mm in long) are not uncommon. The maximum diameter of the feed is ranged in 80 to 85% of the width of the maximum opening. Such a heavy crusher (16540x 2150mm) crushes rock, mineral or ore varying from 22.5 cm to 30cm with a capacity ranging from 420 to 630 ton per hour. The motor rpm and power are around 90 and 187.5 kW respectively. The jaw and the sides of the unit are lined with replaceable wear resistant plate liners.