Drill BitChina Factory High Air Pressure Reverse Circulation DTH Hammer with RC Bit Re542, Re543, Re545, Re547, Re004, Re531, Pr40, Pr52, Pr54, Ad670, RC45 High Quality, Find details about China RC Hammer, Reverse Circulation Hammer from China Factory High Air Pressure Reverse Circulation DTH Hammer with RC Bit Re542, Re543, Re545, Re547, Re004, Re531, Pr40, Pr52, Pr54, Ad670, RC45 High Quality