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Originally Posted by
cdmurphy
Those are solid carbide "circuit board" drills. They're designed to be run at ungodly speeds in precision spindles for printed circuit board production (100,000+ rpm)
The trouble is, they're extremely delicate. I've never been able to use any but the largest by hand in a Dremel without snapping them off. You would be much better served using high speed steel (hss) or cobalt drill bits. Much tougher, and more than hard enough for drilling out screws. Try McMaster-Carr for a large selection of drill bits, and fast shipping.
That being said, it's still a very dicey operation, especially if you're not very skilled, and lucky. (I'm a machinist by trade, and I doubt I'd have more than a 50% chance of drilling one out without just making it worse.)
Yeah - I used the tiny bits just to start the pilot hole, which needed to be centered.
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