Introducing our high-quality black iron square tube steel pipes, designed specifically for construction purposes. With a promotion of 40x40mm and 6m length, our pipes are perfect for building durable structures. Our factory produces pipes that are made from premium materials to ensure strength and longevity. The pipes are black iron coated, giving them a sleek and modern look, while also protecting them from rust and corrosion. Our team of skilled professionals ensures that every pipe is made to the highest standards, meeting all industry requirements. Choose our black iron square tube steel pipes for all your construction needs, and trust in the quality and reliability of our products.