The Fiberglass Offset Insulator is one of the lowest cost offset insulators. The pencil-pointed fiberglass rod can be driven directly into trees or freshly treated posts. A drive cap should always be used for installation. In harder posts a 5/16" pilot hole should be drilled. Fiberglass is a great insulator and much stronger than plastic. A spring clip (F3S) is required to support the wire in the offset and is sold separately.
