VEVOR Tomato Cages, 11.8\" x 11.8\" x 46.1\", 10 Packs Square Plant Support Cages, Green PVC-Coated Steel Tomato Towers for Climbing Vegetables, Plants, Flowers, Fruits

Maybe 4I had to trash mid of them. They are so weak for tomatoes. Wind blew over and they bent and broke

4, it’s a square.

I don't know, but it's sturdy and I have had it for 2 seasons now.

No idea what gauge, but they are pretty sturdy once installed, while light enough for an 82-year-old woman to handle.