Zareba Fi-Shock IWKNY-FS Economy Insulator with Nails, Yellow

For fastening electrified wire to wood posts without losing energy through the post. Economical insulator with double-headed nail for wood 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.