LWP L-Type 3/8″ Rod Insulator: Manufactured of a top quality, UV resistant black plastic, the l-type rod insulator is one of our most popular insulators. It slides easily from the pointed end of the rod to the desired height and spacing. Once installed, it grips tightly to the rod in order to maintain the wire spacing. The beauty of the half-moon wire holder is that your poli wire is far less likely to escape. While the L-type works best with poli-wire and 1.2″ poli tape, it can also be successfully used with the electric rope or light gauge steel wire.