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Building Construction Rectangular Hollow Steel Pipe Black ASTM A53 40X40mm Q235 Low Carbon Hot DIP Galvanized Square Tube. Wide Customization Options: Customizable grade, thickness, size, and surface treatment to meet specific project needs. Free Sample Provision: Free samples are provided to ensure product quality before bulk purchase. Strict Quality Inspection: Products undergo strict quality testing before packaging; third-party inspection is supported. Flexible Payment Terms: Accepts T/T, L/C, D/P, PayPal, and Western Union for convenient transactions.