Abstract: A fin box for a water sports board including an elongate socket and a flange which extends laterally from the elongate socket. The socket includes a central elongate cavity and a raised lip about the cavity. The elongate socket also includes an oblong cylindrical outer surface. A ramp extends between the raised lip and the flange. The lip includes a surface to receive sealing tape employed for the laminating process. A set screw assembly provides for locking of a fin within the central elongate cavity. Gussets extending between the flange and the elongate socket provide dimensional stability and locational strength as well as serrations for easy insertion into the foam core of a water sports board. The fin box is able to accommodate positioning within a coating of resin in a socket in the foam core of a water sports board with laminating of the board occurring immediately. The cavity is then exposed through grinding.

Abstract: A fin for water sports boards having a urethane leading edge cover molded in place onto an anchor flange having holes therethrough on the leading edge of the fin. The fin is of glass fiber reinforced resin.