Carbide Rotary file safe problem

1, the carbide Rotary file when used in pneumatic or electric tools, speed 6000-40000 r/min must be clamped tool.
2, uniform cutting direction from right to left move, cannot be used as reciprocating the cutting wheel; be careful not to overexert (pressure is generally not more than 4 kg).
3, work because the chips fly, use protective goggles.