Probably the worst tool I've ever bought. The collet was not tightened on the bits, so the item will not work. 12V means it has a 12V DC motor powered by a 12V AC supply rather than a battery. During operation, the roar of the motor can be felt in the plastic case. I have a couple of rotary tools and this one looks like a kid's toy in comparison. The item has been returned.
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