... to design and develop. ZQJ-90/2.3S Pneumatic Bottom Hole Drill Rig is base on MQT Series to design and develop ... easily, reliable performance, simple maintenance, cooperate with our bottom hole drill tools,This drill rig is mainly used in boring downward, and also ... the grout hole, anchor cable hole etc. Model/ParameterZQJ-90/2.3SWorking ...