Introducing our superior quality "Promotion 40x40mm 6m length black iron square tube steel pipe for construction"! As a proud factory, we promise ultimate reliability and top-notch construction material. This durable square tube steel pipe, measuring 40x40mm, is perfect for a wide range of construction applications. With a length of 6m, it offers excellent flexibility for various project requirements. Crafted from premium black iron, our product withstands high-pressure and extreme weather conditions, ensuring longevity. Trust in our factory-direct supply for unbeatable quality and cost-effectiveness. Opt for our black iron square tube steel pipe, the ideal choice for all your construction needs!