Answer:
What is the word that even in plain sight remains hidden?
I am a daily ritual involving using a metal tool on the body
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
What can you break even if you never pick it up or touch it?
The answer I give is yes, but what I mean is no. What was the question?