Perfect for mounting your Windex wind direction indicators away from orther hardware at the masthead or for better visibility from the deck. Positioning a Windex indicator aft of the mast, for example, will often allow the helsman to interpret it much easier. The 13 inch (330 mm) aluminum boom provides plenty of clearance from antennas etc. Features: Overall Length 13 inches (33cm) Weight 3.2 oz. (90g) Comes with all necessary hardware and complete mounting instructions.