The ring is 6 1/2 inches across and 1 inch thick bore is about 120mm, nicely machined up.
Wall section seems to have come from the same barrel 6 1/2 long 4 1/2 wide 20mm wall thickness, needs machining up at the edges. Both would make excellent display pieces for an artillery collectors display.
20 each, postage for each is 12 unfortunately each are near the 5kg mark.