Answer:
What is the smallest bridge in the world?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Snake coiled round and round. Snake deep below the ground. Snake that's never had a head. Snake that binds but not with dread.
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
Break me and I am better immediately set and harder to be broken again.