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Different types of round aluminum extrusion
Round tube: This is the most common type of round aluminum profile. And they are typically used in applications such as piping, structures, and frames. Round tubes can have different diameters and wall thicknesses.
Round bar: Round bars are aluminum profiles with a round cross-section and are usually used to make pins, bearings, connecting rods and other mechanical parts.
Discs: These are round pieces or discs of aluminum that are commonly used for decorative purposes, marking and parts fabrication, ect.
Rings: Rings are circular parts with round cross-section and are commonly used for connection, suspension or assembly. They are used in a variety of industries.

More informationhttps://www.aluextrusions.com/round-aluminium-profile.html