I'm working on a wire rope fence that looks like this. The difference is that we live fairly close to the ocean, which means lots of salty air.
I've bought 1/8" galvanized steel with plastic coating and stainless screw eyes attached to the posts. What's missing are the turnbuckles.
Ideally, I would like to buy stainless turnbuckles. The issue is that they don't sell them locally, and amazon is the only store that ships to my country and has a good selection of rather inexpensive stainless turnbuckles, like these.
On the other hand, I can find good galvanized steel turnbuckles like these anywhere. Those are the two options.
It seems that the galvanized steel turnbuckles are stronger. The problem is that I don't know how long they'll last being so close to the ocean. I can buy the stainless steel turnbuckles, but most of the ones sold in amazon say "light duty" and are being sold by questionable sellers.
Would it be a mistake to buy galvanized steel? Just to give you an idea of how bad the corrosion here is: I bought these pliers, and they had shallow rust spots one week later.