Unfolds to allow access to the roof, folds to allow use as a four-foot or ten-foot step ladder. One ladder that is light weight, serves multiple purposes, and is well-designed and built. Comparable folding ladders are either flimsy, heavy, or a pain to use.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.