The Intova Sport HD Surf Plug Mount for Camera is a compact support system used to mount a Sport HD camera onto a surf board. The camera, within its waterproof housing, mounts onto the screw at the top. The Surf Plug Mount is compatible with X2 and Fusion FCS fin box systems. The bottom tab with the hole in it gets inserted into the slot on your FCS fin box system and is secured by a screw. The fin box itself gets mounted onto the surf board, usually at the top of the front end.