The Nantucket Collection provides you with a cohesive look in your outdoor space. One of our bigger collections the Nantucket has something for everyone and is sure to stay relevant for decades to come. These corbels are made from 100% high-grade Polyethylene and are weatherproof. Corbels attach easily to the existing wall mount brackets that come with the Nantucket window boxes (model numbers: 4829 4830 4831 4832 4848) - it comes with 2 decorative brackets and 4 mounting screws.