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API li-cones tse tharo li nyane IADC537 11 5/8″(295mm) bakeng sa hantle hantle
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E potolohang tri-cone bit IADC537 12 1/4″(311mm)
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Metal e tiisitsoeng ka tšepe ea Bochabela bo Hōle ea ho phunya mafika IADC537 13 5/8″(346mm)
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API tricone drill bit IADC537 14 3/4″ (374mm) bakeng sa lefika le thata
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Tricone roller bit drilling IADC537 15.5″(393.7mm) bakeng sa seliba se tebileng
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TCI e cheka hanyane IADC537 16″(406.4mm)
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Tungsten Carbide Kenya tricone bit IADC537 17.5″ (444.5mm)
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API & ISO trione roller bit IADC537 26″(660.4mm)