Rectangular Hollow Sections (RHS) are structural profiles with a rectangular cross-sectional shape and a hollow interior. They come in various sizes and materials, including steel, aluminum, and stainless steel. RHS are used in construction for framing and support, architectural designs for aesthetics, machinery and equipment construction, transportation-related structures, and furniture and shelving. The hollow interior reduces weight while maintaining strength. Engineers calculate load-bearing capacities and use proper connections to ensure safety. Protective finishes or paint can be applied to prevent corrosion. In essence, RHS are versatile elements with numerous applications in engineering and construction. 

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Square Hollow Sections (SHS) are square-shaped structural profiles with a hollow interior, available in various sizes and materials. They find applications in construction, architecture, machinery, transportation, and furniture due to their strength-to-weight ratio and modern aesthetic. Engineers calculate load-bearing capacities, employ proper connections for safety, and use protective finishes to prevent corrosion. In essence, SHS are versatile building components with broad utility in engineering and construction. 

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