I've failed at drilling through silver or copper sheet with my Dremel. It does drill plaster, wood .... but there is something about the torque which makes it very ineffective for drilling metal. It's fine for polishing though and a useful hand tool.
If all you want to do is drill holes than I'd recommend a bow drill from your favourite source, this is Cookson's
http://www.cooksongold.com/Jewellery...prcode-999-331. It takes a little practice, but it works brilliantly. Infinitely better than my Dremel (which is not the low end hobby one, so it's not the model that is the problem, but the tool itself).
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