Trellises for climbing plants can be made of various material; stainless steel is one of them. At FassadenGrün you can buy small to medium wall lattices made of stainless steel. Such trellises can be placed individually or in groups on wall surfaces-- one on each side of a house entrance, for example. They can also set accents on garages or allow plant growth to cover a facade. Metal trellises are very versatile! And they have advantages over wire rope systems: due tof their inherent stability and rigidity, they can be used to create small 'meshes' inexpensively, requiring few mounts and drill holes. Such close-meshed trellises offer the plants more "grip" when climbing; this makes clematis and 'perennial bloomers' very happy! For other, especially larger metal trellises, see the last paragraph here for tips, examples, and suppliers.