The ZarebaŽ Duralator Wood Post Self-Drilling Insulator can help you attach electric wire to a wood post while still maintaining the current and avoiding energy loss. The Duralator is a self-drilling, screw-in electric fence insulator that can be used with many different wire types, including high tensile wire.
Large Self-Drilling Screw-In Insulator for Wooden Posts
Can Be Used With Steel or Aluminum Wire and Polyrope and Polywire
Installs Quickly and Can Be Installed With or Without a Power Tool
Manufactured from Sturdy Plastic That Can Outlast Porcelain