Here is a large wood burl that was split in two  that is up for auction.  I don't know what kind of tree this came off of but whatever it was I know it's heavy and the grain is beautiful. You can see that each piece has a screw eye attached to it. I found these had an estate sale hanging from a ceiling. You can see the dimensions of the pieces in the photographs.  The total weight of the burl is 24 pounds. One has an extra screw hole that you can see in the last photo.