Chain wire fencing, also known as chain-link, chainmesh, or cyclone fence, is a type of woven fence usually made from galvanized or coated steel wire. The wires run vertically and are bent into a zig-zag pattern so that each “zig” hooks with the wire immediately on one side and each “zag” with the wire immediately on the other. This forms the characteristic diamond pattern seen in this type of fence.