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. Compatible with the Mayne Cape Cod, Fairfield, and Nantucket window boxes. Will also work with the Yorkshire window box but some modification is needed (holes in the Yorkshire decorative brackets need to be drilled out to 1/4 inch diameter).