The Black Max is a versatile, high performance wind direction indicator that attaches quickly to masts and booms on most small boats such as Lasers and Sunfish. On catamarans, it can be attached to the end of a spinnaker pole in place of a bridle vane. The unique adjustment system fits masts, booms or spinnaker poles from 1.5" to 2.5". The tough, high-impact plastic vane is designed to withstand years of punishment and the abuse of small boat sailing. Features a durable stainless steel mounting arm and set screw and a tough plastic mounting base. Wind vane length is 8". Comes in its own unbreakable storage tube.