Soft Formations with te Low Com pressive Strength and High Drillability STEEL TOOTH Medium to Medium Hard BITS Formations with High Compressive Strength Hard Semi-Abrasive and Abrasive Formations Soft Formations with Low Com pressive Strength and High Drillability
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Soft to Medium Formations with Low Compressive Strength Medium Hard Formations with High Compressive Strength Hard Semi-Abrasive and Abrasive Formations Extremely Hard an d Ab rasiv e Formations