Promax|SUP Board Fin-Hatchet Surfboard Fiber Glass Resin Longboard Fin 8" Blue Height: 8inch(21.0cm) Base: 5.2inch(13.0cm) Promax Longboard Fin can use in 2+1 or single fin setup Unique Design,Low price,best high performance core,best quality better than Fcs materials Install and remove your fins in seconds, without the need for any screws or tools.