spade bit
Photo: Keate
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Spade (for wood)

These are good for making rough-edged holes in framing for plumbing and electrical lines, but most require constant pressure or they stop digging. This spade bit is different: With its threaded tip and angled spurs, it pulls itself through wood; you just pull the drill's trigger. About $3 for the 1-inch ­shown; 1/4 inch to 11/2 inch;
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