These are osha approved type 1 mettalic sectional ladders 6 ft sections allow to be used with 2, 3, 4 or with another section 5 pieces for up to 25 ft I have four sections for 500$ total. Each section retails for 240-260$ each so it's value is over 1000$ I use for window cleaning/pressure washing and gutter cleaning. But the uses are vast. So you can Put a 24 ft ladder in the back of the truck and take up an elevator or assemble indoors where an extension ladder would not have made it through the home. Also eliminates the need for multiple ladders. They are lighter weight than traditional extension ladders and very durable. I can answer any questions you have I have another set I am keeping but I can't justify needing two anymore since I mainly work alone