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6m Length 3 Inch Wrench Flat DTH Drill Rod / Water Well Drill Pipe. Wide Length Range: Available lengths from 1m to 9m to suit various drilling requirements. High-Strength Materials: Constructed from R780, E75, X95, G105, and S135 alloy seamless pipes. Advanced Heat Treatment: Features friction welding, nitrading, and upsetting for high toughness. Rust Prevention: Coated with paint or anti-corrosive oil; threads are nitrided before shipping. 24/7 Technical Support: Engineers available online around the clock for immediate assistance. Flexible MOQ: Minimum order quantity is only 10 pieces; small orders are accepted.