The archimedes drill is a very useful tool for making small holes in a variety of materials. At the chuck end they have a floating collar you hold to steady the device and use your other hand to plunge the handle causing the archimedes screw to turn. As such you can moderate not only the speed, but also the downforce. This results in a sensitive drill thats really handy when accuracy and good finish are important. I use mine often to pick up small marks/punching when a centre drill would be too large. I've also used it for PCB drilling when hand etching boards as it gives cleaner results than a dremel type tool.
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