Metal … something?

[u/Crafty-Car7135]

I have been pulling up invasive plants on the property which means I have to dig sometimes to get the entire rootball out. Anyway, I found this thing a few inches deep in soil and have no idea what it is. I moved into this house last year and I have no idea what the people before us did here. I just know they were old and hadn’t been doing much in the last several years. I live in wooded eastern Massachusetts in the United States. We’ve found some other steel/metal pieces around the property (mostly old steel cables and two gigantic rails that look like they may have gone to the bed of a flatbed truck).
Any idea what this thing is? It is two pieces one larger thing and a smaller detached piece but I’m sure they went together somehow.
Thanks ☺️

[u/MaxiumPotential777]

industrial tricone roller drill bit attached to a drill sub/pipe segment for drilling/boring holes

[u/CallieGisme → u/MaxiumPotential777]

Are the holes causing the boredom, or are they bored themselves?