The 75mm powapost fence post extender is a strong steel box designed to help you extend the height of a fence post so you can add decorative fencing panels like trellis this fence post extender is made from high quality dual coated steel designed to be rust resistant and strong the steel used is zinc plated and then covered with a coating or moisture resistant powder designed to help keep this post extender rust free using the post extender is simple and quick fit the post extender over you