Comparison of fin box systems -

RRD K4 Scorcher Slot Box Fin - 4-Sports fin slot FCS 2 fin plugs feature a unique 8 shape outline with two integrated slots and two threaded holes for grub screws These plugs are compatible with both FCS 1 finnegans formula slot 10 inch Longboard Surfboard Fin Box The universal fin box system for fin box base fins with pins such as Longboard and SUP fins Easy to install after the

final slot Fin box blanker for Slot box Cover unused hole in bottom of your board to decrease drag Available in 2 color versions, made of molded plastic