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11-
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Cangzhou Great Drill Co., Ltd, as one of the biggest manufacturers of drill bit in Hebei province, my company specializes in drill bits, tricone bits, PDC bits, bit size range from 3 7/8"to 26", and cover most of IADC codes. We also manufacture drill pipe, mud pump and stabilizers for water well, oil field, construction, geothermal, directional boring, and underground foundation work all over the world with high quality and reasonable price.
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