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Double/Triple Tube Bq Nq Hq Pq Nq3 Hq3 Core Barrel Assembly-Drilling Tool Carbon Steel Forging. 60 Years Experience: Earliest factory producing drilling tools with over 60 years of industry experience. Customization Available: Accepts customized products based on customer drawings or samples. Low MOQ: Minimum order quantity is as low as 1 piece. Free Samples: Small value free samples provided upon request. Logo Customization: Private labeling and logo printing services are available. Quality Guarantee: Free replacement for products with defects caused by the manufacturer. ISO Certification: Certified with ISO 9001 and ISO 5001 standards. Carbon Steel Material: Constructed from durable carbon steel for forging.