Knockout punches, such as Greenlee's ubiquitous Slug-Buster, can be used to make holes much larger than a portable hand punch can handle. Commonly used by electricians to punch holes for conduit, knockout punches are easy to use and provide great results, but larger sizes are prohibitively expensive.
Neiko Hand Held Power Punch, Sheet Metal Hole Punch Kit, Eurotool EuroPower Punch Round Hole Punch P...
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