What am I?

I am the ruler of shovels, I have a double, I am as thin as a knife, I have a wife. What am I?

related riddles

I pass before the sun, yet make no shadow. What am I?

I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?

I am used to bat with, yet I never get a hit. I am near a ball, yet it is never thrown. What am I?