Dorsal Longboard Surfboard Fins - Stainless Steel Plate Screw Stainless Steel Screws that fit all standard longboard surfboard center fins. Longboard Center Surfboard Fin Screw - Screw and Plate 1 2 or 3 Pack The DORSAL Screw allows for you to make fin changes on the fly. Simply tighten in your new template and away you go.