Five Oceans Wind Indicator with Sensitive Ball Bearing, 14 1/2" FO-2080 SUITABLE for Boats 15FT (4.6m) and bigger STURDY Vanes and fully adjustable tacking tab system offer many years of use BIRD-PROOF spike extends above vane to keep the birds off the mast. MOUNTING on the side, top or front of the mast DESIGNED specifically to provide the helmsman with accurate information of the apparent wind direction LENGHT of the wind idicator is 14 1/2" (368mm)