Tough - Versatile - Sensitive 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. The tough, high impact plastic vane is designed to withstand years of punishment and the abuse of small boat sailing. The stainless steel mounting arm and set screw, as well as a tough plastic mounting base, add to the system`s durability. Wind vane length 8" (203mm). Protective storage tube To be sure the vane survives when the rigors of sailing are over, Black Max comes in its own unbreakable storage tube.