Answer:
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Though I have neither legs nor feet, my use is for to go; Although I cannot speak, I tell what others want to know
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
What breaks on the water but never on the land?
My days are numbered.