The EFL Horizontal T-Post Bracket is designed to slide over the T-post and locks into position. You can now mount objects from the bottom side such as bird houses, feeders, rain gauges, garden owls, lights, and so much more. They are very easy to install and fun to work with. The T-Post mounting bracket will hold up to 25 lb. For assurance, these fence post brackets have a 1 year warranty against rusting.