The excellent performance of hydraulic hammer chisel is the basis to ensure the efficiency of crushing construction.The shapes of the chisel head includes:cone head, wedge head , blunt head. Different chisel shapes certainly have different effect in the crushing construction. Cone head chisel is a widely used type which has more penetrating power, even if the hard objects can also be split easily by the force.This type of chisel focuses power on a little bit to get strong force then crush big area.Even extreamly hard objects like hard rock,hard concrete can also be easily crushed.This kind of chisel is suitable for large crushing area like mountain cutting, road building, demolition and other operations. Wedge head chisel is another widely used type.It is more wear-resistant in the same working condition,because this type is suitable for handling hard materials. The wedge head is also suitable for excavation and ditching operations of sedimentary rock, high hardness crack rock and all kinds of soft and neutral stratified rock. The blunt head chisel is mainly used for the crushing of medium hardness stones or breaking small stones.The energy is released through big surface on the head which will not produce torsion to make very good crushing effect. The principle of using hydraulic breaker is to choose the right chisel according to the actual working condition.The choice of chisel has the same importance as the choice of crushing hammer, because the chisel directly contacts with the hard material and will directly stressed, improper chisel will affect the crushing effect and efficiency.