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DTH Drilling Equipment with API 3.5'' Reg Thread 3m 3" 3.5" 5'' DTH Drill Rod, Find Details and Price about Drilling Rod Drilling Pipe from DTH Drilling Equipment with API 3.5'' Reg Thread 3m 3" 3.5" 5'' DTH Drill Rod - Xiamen Zhaoxing Machinery & Electric Equipment Co., Ltd.