What is designed to go into holes and always has a hole in it?
It fits this pattern:
S _ _ _ _ _ _ _
What is designed to go into holes and always has a hole in it?
It fits this pattern:
S _ _ _ _ _ _ _
Is it a
shoelace?
because
Shoelaces are threaded through holes in a shoe, and the word 'shoelace' always contains the word 'hole'
Are you a
Doughnut
Because
It goes in your mouth-hole and it has a hole.
Also
It has 8 letters.
It's:
syringes
because:
They're designed to make a hole to go into and have a hole to squeeze medicine through
Or with hints removed and fitting What is better:
a syringe.
It seems to me that the main body of the puzzle should be sufficient to uniquely specify an answer. Hints should be for making it easier to find that answer, not eliminating duplicate answers (that is, it's not valid to reject an answer because it fails to satisfy the hints). An answer that satisfies the main body of the question is
Shovel