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API peb cones ntsis IADC537 11 5/8 "(295mm) rau qhov zoo
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Rotating tri-cone ntsis IADC537 12 1/4 "(311mm)
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Hlau kaw Far Eastern pob zeb drilling ntsis IADC537 13 5/8 "(346mm)
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API Tricone laum ntsis IADC537 14 3/4 "(374mm) rau pob zeb tawv
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Tricone menyuam ntsis drilling IADC537 15.5 "(393.7mm) rau qhov tob tob
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TCI Drilling ntsis IADC537 16 "(406.4mm)
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Tungsten Carbide Ntxig tricone ntsis IADC537 17.5 "(444.5mm)
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API & ISO tricone menyuam ntsis IADC537 26 "(660.4mm)