Thunderbird No 17 Screw In Wood Post Insulators
Product Information
These are a great insulator for wooden posts. They are a darn sight stronger than nail on insulators, easier to install and remove the tape from, and with a nice big hole through the middle, you can still get a decent pull on your wire or cord even over a run of many hundreds of metres. With a normal wood post insulator, you need to keep tensioning every 2/3 insulators.
They are a few cents dearer than the standard pinlocks or nail on's - but in our opinion worth those cents.