Most drills use "drill bits". Drill bits are long, thin cutters with teeth at one end. The bits are held in the drill by a circular clamp called a "chuck". Because a single chuck can accept many different sizes of bits, different sizes and types of bits can be used in the same drill. Changing the bit in a chuck is fast and easy. The smallest drill bits look like needles, while the largest drill bits can be as big as a truck. Most drill bits are between a toothpick and a big marker in size.
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