I've been using black iron wire 14 mils in diameter (30 gage?)to
replace grab irons.
I bought a spool of it for >$3 from McMaster Carr.
It's a little too large in diameter but it's black as midnight. It
looks particularly good as grab irons on reefers. I don't know how
I've tried without success to find similar wire in smaller diameter.
This wire is very soft, comparable to the horrible green florists'
wire found in older kits.