Fits all T-posts and can be nailed on top of Wood Posts. Protects horses and other valuable livestock from sharp, jagged T post tops. Large heavy-duty cap and insulator can be installed with wire holders facing front, back, right or left. For all wire, olywire, polyrope and tape up to 1-1/2 in. Will face all directions. Molded of high-density polyethylene with UV inhibitors for all weather performance. Yellow.