The Zareba® Yellow Corner Post Insulator is formed of thick, tough plastic that can withstand the strain of wire on your electrified fences. These electric fence insulators are packed 10 per bag.
Fastens electrified wire to round or square post fence without losing energy through the post
Formed of thick, tough plastic
Can withstand the strain of wire at corner of electrified fence
For 9-22 gauge high-tensile steel wire, aluminum wire, all polywire (regular and heavy duty), and polyrope up to 1/4-inch in diameter
It's difficult to assign a rating to a simple item like this, but it was exactly what we wanted -- had to be the yellow one, not black. Our local store stopped carrying this particular item among their insulators, so I was happy to find the web store. We also use several other styles of Zareba insulators.