Thanks. They are great for taking to construction sites as they take little room with the loading but have the capacity to extend in size for larger jobs. This set has lasted for 30+ years and have acquired many coats of paint over the years. Once used they make it hard to go back to standard designs. And the collapsible ones in the hardware stores would collapse under the loads these carry. I have had more than 300 pounds of weight on the set of two without any flex so they are far stronger than they look.