This low-cost offset insulator 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 (F5S) is required to support the wire in the offset and is sold separately.
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