Answer:
When I’m metal or wood, I help you get home. When I’m flesh and I’m blood, In the darkness I roam.
Glittering points that downward thrust. Sparkling spears that never rust.
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
Only two backbones and thousands of ribs.
My first is equality; my second is inferiority; my whole is superiority.
What never gets any wetter no matter how hard it rains?