T-post insulator. Ideal for use with Equi-Rope, X-Treme power line, coated wire, and large diameter fence materials up to 3/8-inch. Compatible with 1.25 and 1.33-pound/foot T-posts. Large flange prevents arcing. Snaps on and around posts. Molded of high density polyethylene with ultra violet inhibitors for all-weather performance. White.