Our charcoal grate supports are made from solid half-inch steel bar. But if you are burning hot fires on top of the charcoal grate, even something this burly can sag.
Please note that we recommend burning fires in the bottom of the basin, with the entire charcoal grate assembly removed. They are called charcoal grates because they are for cooking over charcoal.
That said, if you insist on burning atop the assembly, please note that if you flip the support piece over at the first sign of sagging, you’ll never have to replace this piece again.