Very cool! They have ones that cut the whole top off and leave it smooth but that is much better. Now I want one.The purchasing of anything new has been a hold as of late but I did recently receive something I crowd funded about 6 months ago. It's called the draft top. And in very simple terms it cuts the center top out of the can. Leaving no rough edges at all. It's super nice especially for beer where you want the full taste but for a variety of reasons you don't want to use a glass/cup. I've been pretty impressed with it so far.
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