Water Fed Solar Panel Cleaning Brush with 5-sided Soft no Scratch Brush Head and Telescopic Handle Pole Handle Material High-density Aluminum Alloy or Customized Brush Head Poly , Black Color Brush Head Dimensions 13.5 inch (290mm ) Pipe Diameter 11.4/26.7/30.2 mm Scope of use window cleaning, photovoltaic panel cleaning, bus / exterior cleaning, large vehicles, trucks, trucks, caravans,boats, etc.