Description: Mechanism; Fast Hi Revs Up / Down Faster Speed.

Description: Mechanism; Fast Hi Revs Up / Down Faster Speed.

Description: Mechanism; Fast Hi Revs Up / Down Faster Speed.

Description: Mechanism; Spins Up / Down, Crazy Rev Slow Speed.

Description: Mechanism; Spins Up / Down, Crazy Rev Slow Speed.

Description: Tool; Drill Rubber Run Steady With Whine And Hum Slow Speed.

Description: Tool; Drill Rubber Run Steady With Whine And Hum Slow Speed.

Description: Tool; Drill Rubber Run Steady With Whine And Hum Slow Speed.

Description: Mechanism; Fast Rev Burst With Buzz And Whine Faster Speed.

Description: Mechanism; Fast Rev Burst With Buzz And Whine Faster Speed.