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Specification OD: 3-1/2', 4-1/2', 5', 5-1/2' Connection:NC38, NC46, NC50, 5 1/2 FH Material: AISI 4145H Alloy Ste... Integral Heavy Weight Drill Pipe Bobi Petroleum Drilling Tool (China) Co., Ltd The wall thickness of heavy weight drill pipe is between drill pipe and drill collar, its structure is similar with drill pipe.
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