I've seen reports of bad usage, you shouldn't have a problem. I'm a master mechanic, I use them in a cordless drill to start and run. I've had them for over a year now and no problems so far. I got them mainly for the extra length which helps clear a lot of things. Whenever I need to loosen a fastener or tighten something, I use the right nut for the job. I have to admit my set was missing a 3/16 bit, I contacted them and they immediately issued a replacement set. I am very happy with this purchase.
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