The Mayne Adjustable Deck Rail Bracket provide just what you need to accent your porch or deck railing with a Mayne window box (not included). The adjustable deck rail brackets simply bolt to your existing window box brackets for an easy installation over a 2 x 4 or 2 x 6 wood railing. Wondering how many you need? Look to see how many wall mount brackets were originally included with your window box. That's how many deck rail brackets you'll need. The brackets include a 1-year limited warranty. Dimensions: 5.8L x 1.8W x 9.8H inches.