Answer:
Voiceless it cries, wingless flutters, toothless bites, mouthless mutters.
Though blind as well, can lead the blind well.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
I'm not really more than holes tied to more holes. I'm strong as good steel, though not as stiff as a pole.
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
I have two eyes in the front and a lot of eyes on my tail