Electric Drill - Best Tools for the Weekend Warrior - DIY Essentials - Bob Vila
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The basic electric
drill consists of a motor built into a pistol-shaped body. Instead of a gun barrel, though, there’s a gripping device called a chuck into which one of a wide variety of drill bits are inserted. Older models lock the bits in place using a key that tightens the chuck, but most new drills use a keyless chuck that requires only the grip of your hand to tighten it.