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China
الشخص الذي يمكن الاتصال به Mr. Jason
Bei Yi, Dongying, Shan Dong
Features: Our drilling rod is manufactured with advanced frictional welding and thermal treatment, and has a perfect appearance after burnished by NC machine tool and special device. Each rod has been detected by magnetic powder, ultrasonic wave and electromagnetism, and then has a reliable quality. Every parameter satisfies API criterion
