Black Max Wind Direction Indicator Black Max is a versatile, high performance wind direction indicator that quickly attaches to a mast or boom. The heavy-duty paddle is built to withstand years of punishment from high-impact plastic paddles and small boat abuse. The stainless steel mounting arm and set screw, as well as a rigid plastic base mounting system, add to the & # 039; s durability. Wind Vane LengthIs 8" (20 cm). Black Max is packed in its own unbreakable storage sleeve to keep them in when not in use.