Fiberglass Offset 3/8" x 12"
One of the lowest cost offset insulators is the Fiberglass Offset Rod. The pencil pointed fiberglass rod can be driven directly into trees or freshly treated posts. A drive cap should always be used to install these. In harder posts a 5/16 inch pilot hole should be drilled. The fiberglass is a great insulator and much stronger than plastic nail-on offset insulators which often break in the first winter. A spring clip (F3S) is required to support the wire in the offset and is sold separately.