Bolt-on Covered Hinge Kit. Provides an elegant and safe way to connect ramps to docks and floating docks together. Made from sturdy marine grade aluminum our inovative hinge kit will fasten to any wooden, steel or aluminum dock and will not rust. The exclusive hinged cover closes down over the top of the hinge covering the gap between dock sections making your dock system safer and cleaner looking. Comes in 4’, 5', and 6’ widths.