Answer:
What can stand in place of a country but still fold away in a drawer?
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
It doesn't live within a house, nor does it live without. Most will use it when they come in, and again when they go out.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.