Binding wire
Binding wire is used on mesh fences that are attached to drilled tubular posts. It is twisted around the post and wire, through the holes in the post and used to secure tension wire and mesh to posts.
Binding wire is typically thinner than the wire used to manufacture mesh, and is usually 2.5mm diameter or 14 gauge. It is available in a variety of finishes including galvanized and PVC coated, and it is usually sold in coils.