Zareba Fi-Shock IWTPLB-FS Pin-Lock Insulator, Black

For tightly fastening electrified wire to wood, metal and T-posts without losing energy through the post. Durable and dependable. Tightly fastens to 1.25 or 1.33 T-posts. For 9 to 22 ga high tensile steel wire and aluminum wire, all polywire (both regular and heavy-duty) and polyrope of diameter up to 1/4 in. Molded pin holds wire tightly. Pull pin to release wire. Black color. 25/Bag.