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I have a couple of the air die grinders from HF. They are both still kicking after about a year. The straight one has a 3/8" carbide bur in it permanently and the 90* has a scotch lock arbor. I use the 90* more than the straight and it is starting to get just a bit of play. I think my dry air and frequent oiling is what keeps that cheap crap alive. :redneck: