Item Number:Accent your porch or deck railing with a Mayne window box. The adjustable deck rail brackets simply bolt to your existing window box brackets for an easy installation over a 2x4 or 2x6 wood railing. Black powder coated steel deck rail brackets. 3-Pack. Adjustable brackets designed to fit over a 2x4 or 2x6 wood railing. Hardware included to attach brackets to the window box brackets.