The Skylon X-Treme Pro XT Tower fits boats 20' or longer. One of the most rigid towers on the market, it easily collapses without tools utilizing "Heim" joints and turn knob design. 360 degree unobstructed visibility for driver and passenger. Large 2 3/8" diameter tube. Constructed from aircraft grade aluminum. Available Black Powder Coat or Brushed Aluminum. Additional freight surcharge: $130.00. Shipped direct from manufacturer; Allow 1-3 weeks delivery. Mirror and board racks sold separately, speakers not included.