Question about Siena Garden Fire bowl

I would estimate the thickness of the material to be about 3mm (no guarantee) - but it is very robust (I carry it back and forth and it may withstand a lot). I bought this lid: Gautzsch lid but basically all lids that are more than the diameter of the bowl are possible. The lid is heavy enough to hold the pan without any bracing and you can go to sleep without worrying, even if the fire was still blazing ;-) We don't have a ring and have just ordered a grill grate, because it's really cold outside only with embers and without a fire - so we're waiting for balmy spring days with the grill grate :-D