An Aluminium Square Pipe (also called a square tube or hollow square section) is a hollow aluminium profile with a square cross-section. It is widely used in construction, fabrication, furniture, industrial equipment, and architectural applications. Features Lightweight: About one-third the weight of steel. Corrosion-resistant: Naturally resists rust and weathering. Good strength-to-weight ratio: Suitable for many structural applications. Easy to fabricate: Can be cut, drilled, welded, and machined. Attractive appearance: Often used where aesthetics matter.