That's what I thought too. Looks like the rock teeth I used back in the day on the tip of my auger when I would dig pole holes in hard/rocky dirt. Had bout 5-6 on the piece that went on the end. Next time I go back up to the shop gonna get one to compare it to.
I just googled it and I could see it being one of those. While I was looking at the pic my neighbor called and said, "I think it's an asphalt bit" for grinding asphalt. He said there's a young guy in our neighborhood that works for an asphalt company.
Also, on top of the box they're in it says "Road King".