I’m guessing Farm related. Here’s more info: the square hole is 1” on one side and 3/4” from the other side; possibly wallowed out. The smaller round hole is 5/8” on one side and 1/2” from the other. The ring on left of photos had a 2” inside diameter. The other ring measures 1-3/4” i.d. The rings don’t look worn out. I’d guess the taper was intentional. I thought maybe a mount for a bucket on front of a tractor. Thanks in advance for any help.