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Sdk Hard Rock Mining 89mm 102mm T51 Thread Retrac Button Drill Bit. Customized Color Options: Color is customizable to meet specific customer requirements. Wide Diameter Range: Available in 89mm, 102mm, 115mm, and 127mm sizes. Fast Delivery Time: Usually 25 days for production, or 2-3 days if stock is available. High Quality Materials: Made from high-quality alloy steel bar and tungsten carbide. OEM and ODM Service: Custom product requests are fully supported and served well. Strict Quality Control: Experienced QC team performs strict inspection on every order. After-Sales Support: Engineers visit site to solve problems; free replacement for quality failures. ISO9001 Certified: Product meets international quality management standards.