Zareba Electric Fence Black Poly Tape T-post Insulator - 25 Pack PT25TP Electric fence black Poly tape t-post insulator Specially designed for Poly tape up to 1-1/2 inch wide Fits t-posts from 1-1/4 to 1-3/8 inches Accommodates Poly tape, Poly wire, and Poly rope up to 1-1/2 inches wide Snaps easily but securely to posts