I can't find any defects even when I search. The quick change system is pretty much redundant as these blades seem to last forever. I've cut through a sturdy steel computer case to make a custom order and I haven't burned through the first blade yet. He keeps working steadily without complaining about it. The value is tremendous for the amount of work you can do with it; You will hardly find anything with better value for money. While I don't have an exact RPM specification, they can rotate at the maximum setting on my Dremel tool, which is great for reducing the time it takes to make a cut and minimizing noticeable friction during the cut.
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