These breakers, which are used as primary and secondary, are ideal crushers to break the materials with high mohs hardness (materials of river and basalt). They break the materials by compressing them with two fixed and movable jaws. If the materials into the machine are hard to be broken, then the jaw crushers do not harm themselves through the safety plates which will be broken in a certain load. The main body is manufactured from tension and high-pressure resistant sheets/materials. Material crusher jaws and side liners are produced from the 16% - 18% manganese, 1.5% molybdenum alloy steel castings.