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NWG Core Barrel Specifications: Item Hole diameter(mm) Core diameter(mm) Available size BQ 60 36.4 1.5m or 3m NQ 75.7 47.6 1.5m or 3m HQ 96.1 63.5 1.5m or 3m PQ 122.7 85 1.5m or 3m Triple tube surface ...