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Are you looking for a durable and long-lasting insulator? Look no further - the Zareba Small Ceramic Lag Screw Insulator is made of porcelain, an extremely strong type of ceramic. So strong that it can be expected to last the lifetime of the fence. To install, simply screw the lag insulator into a pre-drilled hole in your wooden post and slide your fence line through the insulator. The Zareba Ceramic Lag Screw Insulator works with traditional fence wire, high-tensile fencing, polywire, polyrope, and polytape up to 1 inch. Insulators ensure that the fence wire stays electrified and prevents it from touching posts that would absorb and mute the electricity.