AA, I don't know what they are called, but they look like the spikes that go into a bulldozer/tractor front thingie that breaks/aerates the ground. I found several like yours a couple of years ago, and they were ID as such. I threw mine away, but will see if I can find the pics. Breezie
The spike looking things are carbide tipped rock teeth for a rock wheel or asphalt grinder. These are used to cut trenches or cold plane asphalt / concrete. They are also found on stump grinders.
YES! What Taz and HavilahSprings said. Since I'm not the 'tool-time' person, I knew and half remembered the ID ones I had, but didn't know the official name. Breezie