30 Piece Rotary Tool Bit Set

30 Piece Rotary Tool Bit Set - $19.99

Burrs (sometimes called rotary files) are small cutters used in die grinders and rotary tools. They are also used in CNC machining centers for removing burrs (the small flakes of metal) after a machining process. To maintain the correct surface speed and cutting conditions, they are rotated at the highest speed possible.

Burrs usually spin at several thousand RPM. Because the cutting edges are so small, they can be touched when spinning by a finger without cutting the skin, which flexes out of the way, although it would not be safe to pinch or grip them from two sides. Hard metal or ceramic workpieces cannot flex beyond the cutting edges, so the tools remove material from them..