You are looking at a set of 4 large cast iron heavy duty caster wheels. These are off of a very heavy antique safe. We did not see any cracks or breaks. The wheels have slight play in them.
All 4 turn freely and work as they are supposed to. Each wheel weighs 12lbs 4oz and has a diameter of 5 inches. The length of each is 8 1/2 inches, the width of each is 5 3/4 inches, and the height of each is 7 7/8 inches.