This is a 66-inch cross brace that can be used to add more stability and support to large canvases. Cross braces can be an effective way of helping to preserve your art work by preventing it from bowing or breaking, and they are important for large canvases that don’t get enough stability from their frame alone. You can add one cross brace to your work but you may need a second one if your work has square dimensions. You should speak with a framing expert to determine your specific needs. This cross brace is pre-notched, and it is heavy duty and designed for long term durability.