The ⭕️ part in photo 2. This is a repair part for those who have lost their spring pin (split pin). This is a set of two types of spring pins (2 pieces) for the box center fin, used in our factory. *The board and fin in the photo are not included. Pin hole sizes vary depending on the manufacturer, so please purchase only if you can perform self-repairs. If the hole is small, adjust it with a drill, etc. Place wood or similar material above and below the pin and hammer it in. Please refrain from claims regarding installation (size mismatch, fin damage, etc.) and returns. ■Seller Ka poli o ka ‘ehu kai Type... Center Fin Fin System/Fin Box... Center Fin Box Number of Fins... Single Fin