Rod Post Screw-On Insulators quickly and easily connect electric fence wires to rod posts from ¼" to 9/16" in diameter. They hold most types of electric fence wire including poliwire and ½" politape. Excellent arcing protection reduces shorting. Made from UV-stabilized plastic for long life. To install, fit the insulator over the rod post at the desired height, tighten the plastic nut, and insert the wire into the claws on the front of the insulator.