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7 7/8 Nti Iadc 127 Dej Zoo Milled Hniav Drill Bit
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7 1/2inch 190mm Tci Cov Menyuam Lub Cev Rau Nruab Nrab Hard Tsim Dej Drilling
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6 3/4 Nti Iadc 217 Hlau Hniav Tricone Pob Zeb Rau Qhov Zoo Drilling
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