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Down The Hole DTH Tool Button Bit Rock Drilling Tool. High Grade Tungsten Carbide Buttons Super wear-resistant carbide buttons, strong impact resistance for abrasive and hard rock drilling. High-strength Alloy Steel Bit Body Precision forged steel body, good toughness, reduce cracking and deformation under heavy impact. Durable DTH bit with carbide buttons, high penetration for hard rock down-the-hole drilling.