Answer:
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
What has to be broken before it can be used?
Ripped from my mother's womb. Beaten and burned, I become a blood thirsty killer.
Though blind as well, can lead the blind well.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.