This is a single 58-inch cross brace which is used to add more support for works that are 36-inches or longer in at least one dimension. Cross braces can ensure that your work looks great and does not bow when it is being displayed. They are used on large canvases, and this cross brace is easy to install. The bracket set is included with this cross brace at no charge. Adding a second cross brace is simple because these are pre-notched, and the wood is highly durable and designed for years of use.