After the Industrial revolution, the world has seen a huge number of inventions. Machines have replaced the Man at all places. You find these machines into every home now.
You require precision tools in industries every time. Every item of machinery, right from the humble screw to the heaviest machinery would require quality checks to work well. You can never underestimate the importance of the smallest piece of machinery as well.
Also known as the Go-No go gauge, the metric thread gauges have utility in the industry as checking tools for the work pieces.