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Drillmaster Core barrels with roller bits are specialized drilling tools designed for rock coring in hard formations, where replacing standard bullet-teeth bits with roller-cutting elements improves cutting efficiency, wear resistance, and slag management. Our Core barrels with roller bits are offered in various Kelly box sizes (e.g., 130 mm, 150 mm, 200 mm) and are designed to fit standard drilling rigs’ core barrels. The overall assembly length and shell thickness are tailored to achieve the d
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