The Field Guardian Heavy-Duty Tie-On Corner/End Insulators are dead end or corner insulators with very good mechanical properties specially designed for fences using polywire, polyropes, aluminum wire, high tensile steel wire and 1/2 in. polytapes. The corner insulator is very helpful for when you need to run wire or polyrope but don't want to damage your posts. Its wire tie-on attachment method makes the polyrope fencing insulators easy to set up. Each dead end insulator is made from high density polyethylene for incredible durability.