WINDEX 15 is the perfect choice for all family and racing boats from about 29 to 40 feet. The WINDEX Wind Indicator offers exceptionally good performance. The secret is the needle that rests in a safari layer, which means that Windex 15 finds the shifts even in extremely weak winds.Reflector tape on the vane and tacking tabs makes Windex 15 easy to see day and night. Windex vanes are sturdy and, when installed properly, offer many years of use. They have been wind tunnel tested to wind speeds of 40 m/sFeaturesSuitable for medium racing and cruising yachtsDesigned for bolting through the mast top horizontal plate with 8mm holesAdd Part No 50085 for night illuminationSpecificationVane Length: 380mm