Extend your Windex 10 Sport or Windex 15 vane. Perfect for mounting Windex or Telo wind indicators away from other hardware at masthead or for better visibility on deck. A 13" aluminum boom provides plenty of clearance. Will attach to virtually any vertical, horizontal, curved or flat surface. Adjustable to remain level even if surface is plus or minus 20 degrees. Comes with all necessary hardware and complete mounting instructions.