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The boxes are plastic plugs that are inserted into the surfboard , and that allow mounting and dismounting the fins . There are several systems on the market. The main surf box systems are Dual Tab (or FCS type), Single Tab (or Futures type), click tab (or FCSII type) and US box for longboards .
In theory the FCSII boxes they do not need any screws to lock the keel inside the plug. However, in practice, many people use an FCS type screw to avoid losing the keel with a small bump.