Large Jaw With Many Teeth.

Riddle: I move at a high speed or so you'd think by my name. I have a large jaw with many teeth that I open and close with a buzz. Like a train on a broken track, I run up and down your spine. What am I?

Answer: A Zipper.

Source: https://www.riddles.com/2718

I move at a high speed or so you'd think by my name. I have a large jaw with many teeth that I open and close with a buzz. Like a train on a broken track, I run up and down your spine. What am I? — Large jaw with many teeth. by Socialmorais v1.

Riddle: I move at a high speed or so you'd think by my name. I have a large jaw with many teeth that I open and close with a buzz. Like a train on a broken track, I run up and down your spine. What am I? Answer: A Zipper. — by Socialmorais v2.