Zareba Electric Fence Black Poly Tape Round-Post Insulator - 25 Pack PT25RP Electric fence black Poly tape round post insulator Specially designed for Poly tape up to 1-1/2 inches Fits round and rod posts from 1/4 to 9/16 inches in diameter Attaches to post with spin-on nut Accommodates Poly wire and Poly rope up to 1/2 inches wide