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PQ HQ NQ BQ Surface Set Diamond Core Drill Bit For N Series Double Core Barrels Q series core bits Size O.D I.D Availability mm mm Imp. S.S T.C. PDC ....
NMLC Impregnated Dry Diamond Core Bit 6 Inch For Hard Rock Q series core bits Size O.D I.D Availability mm mm Imp. S.S T.C. PDC TSP E.P. AQ 47.75/47.....
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