This 2-Inch Removable Side Click Fin is engineered for easy installation, river maneuverability and more accurate turning. Though this fin can be used when paddling in lakes and oceans, it is specific for low profile shallow rivers and gliding over rocks. To install, place the fin in the click fin box and push back. You will hear a clicking sound. We recommend using the Allen key that comes with your repair kit to tighten each screw ensuring your fin never pops out. The 2-Inch Removable Side Click Fin can be left on your board when it is rolled up and stored.