The general structure of the Rock Breaker, from the pedestal base to the crowd hammer mounting, is manufactured from GRADE 350-400 steel. The hydraulic cylinders mount to stress-relieved, line bored clevis brackets. The pedestal base has the ability to slew at varying angle (varying on different models) via two dual acting hydraulic cylinders or slew ring base and providing greater reach. The main boom and jib arms are fully reinforced for added strength and greater control.