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Title: I have the real dremel 9901
Review: I bought the real deal at Home Depot to cut some duct work. Not to plunge cut, I used a drill bit to cut 4 holes at the corners, then tried to use the 9901 to laterally cut across the plenum for the duct work. Its a joke. Doesn't work , chatters, smokes, and just wont cut worth a darn. I really wanted it to cut a circle duct hole in the sheet metal plenum of the furnace, but decided to try it on a rectangle one first and was greatly disappointed. So not even the official dremel 9901 works for sheet metal as they claim on the packaging. I think the one review here is an accurate one for this tool when they say it worked great for carving a pumpkin. I believe that it what it is good for.
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