Universal Masthead Mount Extend your Windex 10.Sport or Windex 15 vane away from masthead obstructions and turbulence. The 13″ (33 cm) arm comes with hardware allowing side or top mounting and offset angles up to 20 degrees. May be attached securely to flat, curved, vertical, horizontal, or inclined surfaces. Gain space aloft and improve mounting position of wind finders and other equipment. Mount on the back of the mast for easier viewing from the cockpit. The mount adapts to virtually every masthead situation. Length 13″ (33 cm) Weight 3.2 oz (90 g) Boom can be shortened if necessary; complete instructions included Can be used with Windex Light #3200. Also accommodates Davis J-Base Mounts (using #10 stainless steel screws and nuts, not included)