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"  Is there one drill bit that works with multiple materials, including wood, metal and concrete? I want to carry a single type of bit, if possible. There are at least two drill bits on the market that claim to be effective with all materials. Bosch calls its version &amp;quot;multi-construction,&amp;quot; and Artuwhich says its bits will even bore through glassuses the label &amp;quot;multipurpose.&amp;quot; Both manufacturers say the products can be used in rotary or percussion mode, though you obviously wouldn&amp;#039;t want to put a hammer drill to glass! For either brand, a five-bit set costs $18 to $25, depending on your point of purchase. I lug around a lot of tools, so I understand why you&amp;#039;d want to simplify your kit with a universal bit. In fact, I get a lot of use out of my multipurpose tools and accessories. But I do employ dedicated bits and blades depending upon whether a job demands precision, speed or cleanliness. When drilling large holes in lumber, for instance, I reach for a razor-sharp auger bit. Regardless, I still believe in general-purpose bits. A 13-piece set of M2 high-speed steel bits ($10 to $12) can be an asset to anyone who&amp;#039;s handy with a drill. With a tip geometry of 118 degrees, they&amp;#039;ll readily bore through wood and even steel. Incidentally, when drilling steel, use cutting fluid; if you&amp;#039;re using the tool at an angle or drilling upward, use a gel or cream lubricant to make sure that it stays put as you make your hole. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/tools/reviews/a7338/the-only-drill-bit-you-need-to-own/>