What are the different sizes and shapes of aluminum profiles commonly used in building frames?

Aluminum profiles used in building frames come in a variety of sizes and shapes to meet different structural requirements. Common profiles include rectangular tubes, square tubes, angles (L-profiles), channels, and tees. Sizes range from small (e.g., 10x10mm to 30x30mm) to large (e.g., 100x100mm to 200x200mm), with thicknesses varying from 1mm to 6mm or more. Shapes are tailored to specific applications; for example, I-beams and H-beams are used for their high strength-to-weight ratio. These profiles are chosen based on load-bearing needs, aesthetic preferences, and construction techniques.