Picture two gate frames, built to the same spec, fitted on the same day. One is mild steel, one is galvanised steel. A year later, one is holding up. The other has rust along the bottom rail.
U channel, C channel, and lipped channel each serve distinct purposes. Get practical guidance on choosing the right aluminium channel profile for the job.
Metal box section appears on material lists for everything from trailer chassis to kitchen shelving supports, but it is not always obvious which profile, material, or wall thickness is the right call for a given job.