I'm looking to put a hole in my brew kettle for a ball-valve, thus looking into punches vs step bits. Found this on amazon and it looks to be a good deal. From what I've read the greenlee punches are usually pretty expensive thus I'm skeptical of this one. Am I missing something or would this work for a ball valve?
http://www.amazon.com/dp/B0018LC8WI/?tag=skimlinks_replacement-20
http://www.amazon.com/dp/B0018LC8WI/?tag=skimlinks_replacement-20
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