My brother-in-law introduced me to this instrument and I owe him a beer for the recommendation. This is very useful for creating precise internal holes in sheet metal. I made a mount for a small digital voltmeter out of .080 aluminum. In the past I've roughly cut a hole with a Dremel grinding wheel and then cleaned it up with a fine file, but with this tool I was able to drill out some material in the center of the hole and then "bite off" it. the line that saved me a lot of storage time. . I still finished the hole (which was square) with a file, but with practice with the scraper this probably won't be necessary. Great tool and great purchase!