This product use for the rock 8 levels of above 20 level of rock layers, the opening and sneaks in process the stability to be good, wear-resisting, not the easy breaking, to become the porosity to be extremely high. The escape of chips is faster. In sneaks in the process to be able to display its opening performance effectively, to a great extent raised the construction efficiency, is brings more quickly the effective product for the construction advancement
Specifications: 65MM, 75MM, 94MM, 110MM, 113MM, 133MM, 153MM ,