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Mineral DTH Drill Pipe 89mm. High-Strength Alloy Steel: Made of high-strength alloy steel with high torsion and wear resistance. Customizable Specifications: Supports customized length, diameter, and joint types for various needs. Advanced Heat Treatment: Nitriding tool joints suitable for soft soil, sand layers, and hard rock. 100% Quality Inspection: Welds are 100% inspected; strict guidelines for raw materials and machining. ISO 9001:2000 Certified: Manufacturing process meets ISO 9001:2000 certification standards. Forging Manufacturing: Constructed using precision forging processes for durability and reliability.