Find here sold as unit, or complete production sets, boxes corresponding to the Futures fins model you wish to install on your surfboard.
1/2" in. or 3/4" in. correspond to the depths of boxes and to their place: - 1/2" box thinner, is a central box, put generally on stringr of your shape. It is also used for the installation of a quad rear fins. - 3/4" box more thick, is a side box, used for the side fins of a thruster, those of a twin, or for the side fins of a longboard ("side bites") in case of a configuration 2+1.
Unlike other systems of removable fins, Futures fins boxes have no incorporated angle and are put thus very easily in flat on your shape. Fins are, them, conceived with the angle corresponding to their use.