Abstract: A fin assembly including a fin having a base portion, the base portion having at least one extension portion extending from the base portion, at least one extension portion mounting at least one engagement portion, at least one socket mount for substantially permanent inclusion in a watercraft to which the fin is to be mounted, the socket mounting having at least one opening corresponding with and complementary to the extension portion and engagement portion on the fin so that the at least one extension portion and engagement portion can be received in the respective openings; and a securing means for releasably securing the fin relative to the socket mount.

Abstract: A fin assembly (10) is provided for detachably removing a fin (112) in a surfboard (13). The fin (12) has a mounting base (26) and spigots (22 and 23) projecting from front and rear positions on the base (26). A socket mounting (11) defining at least complementary front and rear sockets (15 and 16) for receiving the spigots (22 and 23) is provided for inclusion in the board (13) for releasably mounting the fin (12) to the board. A grub screw or screws (35) is/are provided for securing the fin (12) in said mouting (11).

Abstract: A fin assembly [10] is provided for detachably removing a fin [12] in a surfboard [13]. The fin [12] has a mounting base [26] and spigots [22 and 23] projecting from front and rear positions on the base [26]. A socket mounting [11] defining at least complementary front and rear sockets [15 and 16] for receiving the spigots [22 and 23] is provided for inclusion in the board [13] for releasably mounting the fin [12] to the board. A grub screw or screws [35] is/are provided for securing the fin [12] in said mounting [11].