Check the listing for details. DAVIS UNIVERSAL MASTHEAD MOUNT FOR WINDTRAK 10 OR WINDTRAK 15. Condition: New. Listed at 52.55 USD. Universal Masthead Mount Extend your WindTrak 10.Sport or WindTrak 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. Features:Length 13" (33 cm)Weight 3.2 oz (90 g)Boom can be shortened if necessary; complete instructions includedCan be used with WindTrak Light #3200. Also accommodates Davis J-Base Mounts (using #10 stainless steel screws and nuts, not included)