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Although the photo shows approximately 20-25 pieces, you only get 10. Avoid the disappointment, buy the Dremel parts. Quality seems somewhat mediocre. Had there been 20-25 pieces then it might have been an acceptable value for the price.
But these seem to last fairly well. Good product. Any brass wire wheel or cup is a consumable item. Oh, BTW, using these to remove rust from a pitted antique blued rifle. Metal fatigue is just a fact, and they're going to self-destruct in use. They get into tight places better, too. They also tolerate higher RPMs and more pressure.
They can't take high RPMs or much pressure. Much longer than the brass wire wheels from the same seller. A steel brush would take off the bluing with the rust. On most surfaces, they also have more bristles in contact at once than do the wheels.
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