Corner-Cutting. Sold in sizes from 1/4 inch to 2 1/2 inches, Rover Bits from Bad Dog Tools are the only drill bits I know of that can make curving holes that turn a corner. The maker says they combine the best qualities of Forstner, auger, and spade bits, and leave a clean, flat-bottomed hole. Individual bits range in price from $12 to $63. A five-piece set with a metal case costs $170. Bad Dog Tools, 800/252-1330.

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