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Get one with at least 6 cfm @ 90 psi . That is what it takes to run a die grinder/ mini cutoff wheel. That is the most useful tool I have thats pnuematic. I cant tell you how much time it saves me when I need to cut something that would require a hacksaw. I got a Coleman 5 hp/ 30 gal at Costco for $229 and it's great. It is an upright model, so it takes up less floor space in the garage. Dont get one too small, cuz you'll eventually need to upgrade.
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