The depth of a tapped hole should be greater than or equal to the diameter of the screw. Beyond that depth the strength does not increase much. – R. A. Heindl
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.