FCS Longboard Fin Box Adapter
This neat little device allow you to change your 2+1 longboard to a thruster set-up in seconds. Simple to setup with levelling grub screws which allow the box to be fitted to perfection. You can then slot the centre fin in when you like, add the side fins, and away you go. The centre fin is held in by hidden grub screws that hold the fin tabs in place.
Genuine FCS product.