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I was also very confused by this. I kept thinking "that looks like 2020 extrusions, why does he keep harping on about 8020?".

Googled the company and found they've named themselves not after the dimensions of their products but the "80/20 rule".

Just weird.

The 20mm profile also comes in multiple widths and double thickness combinations, so there is indeed a 80x20mm profile (4x1).

Also, it’s 1 and 1.5 inch t slot, not 20mm.

Weird name indeed.