Hi ffynnon,
I used to have an Omlet coop and run and found the feeders and drinkers very useful, but no, they certainly didn't fit on the 1/2inch mesh of my new larger run. They seem to need quite large mesh horizontally at least, though you can cut holes where necessary to hook the feeders on. When I moved up to the new run I remember poaching a bit of the foxproofing mesh from along the front of the doorway to the run and fixing it between two blocks of wood, screwed to the run sides, so it stood clear of the run sides and I could hook on the feeders to the sort of mesh it was designed for. But I gave my feeders to a friend with a Cube so I don't use them any more.