These were marine grade SS bolts (what ever the hell that is), a magnet will not pick them up. But this thing is one piece now! I used them because I had to fight to get the rusted bolts out so I said I'll go with SS so it will be easy to service the next time. Well that didn't work out, had to trash the whole grill and it was an expensive one. So I would not want to use SS in the head.
I understand about coming loose, I will check mine tomorrow.
I understand about coming loose, I will check mine tomorrow.