Rotary tool
From Self-sufficiency
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The smaller rotary tools use high RPMs to maintain the correct cutting conditions for the tool bits. They have low torque which makes them safer, for freehand use, than the larger higher powered models or similar power tools. A wide variety of accessories are available for applications such as cutting, carving, sanding, polishing, and grinding. The carving (or cutting) bits are referred to as burrs and are similar to those used by dentists.
Similar tools
A tool similar to a rotary tool but larger and more powerful is a die grinder. A much larger tool along similar lines would be the woodworking router.
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