Answer:
A mighty weapon in the war against winged household pests.
A nut cracker up in a tree.
What two things can always see what the other sees, but can never see each other?
Break it and it is better, immediately set and harder to break again.
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.