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That one is off eBay, made by Tom Chambers:
https://www.ebay.co.uk/itm/Tom-Chambers-Classic-Metal-Garden-Arch-Traditional-Black-Sturdy-Arch-/254623855233It's made of hollow square tubing. Seems solid enough, I'm probably more worried it'll blow over in the wind once the plants have gotten big, than rust through. Drilled some holes in four bricks and put it in that with some gripfill at the bottom of the planters, to try and add sturdiness.
Nice - we got one of those arches via neighbourhood freecycle but it'll probably rust through / collapse in a year or two (it's a bit bent already and looks cheaper than yours!). Was pondering getting one made in solid steel rod for a bit more longevity. Anyone got recommendations for a company that makes a better quality garden arch? Otherwise will ask a fabricator.