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API 2 3/8 Reg 2 3/8if 3 1/2 Threaded Rock Drilling DTH Pipe Drill Rod 76mm 89mm Water Drill Rig, Find Details and Price about Threaded Drill Rod Rock Drilling Drill Rod from API 2 3/8 Reg 2 3/8if 3 1/2 Threaded Rock Drilling DTH Pipe Drill Rod 76mm 89mm Water Drill Rig - Shandong Monarock Machinery Technology Co., Ltd.