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Company Products>Hydraulic Drifter HD30  Product Introduction  See Big Picture Brief： Hydraulic Drifter HD30 The HD30  is made for General excavations, quarrying and bolting with hexagonal shank rods with  a shank size of 108mm*22mm. The HD30 can use water  flushing or air flushing. HD30 is  a hydraulic rock drill to drill diameter 32mm to 50mm holes. http://www.dsrockdrill.com。