You are looking at a set of TWO (2) Antique White Porcelain Doorknobs. These two knobs came out of a mid 1800s farmhouse that was getting demolished. Its quite hard to find these types of doorknobs in great condition, as the porcelain was prone to chipping if it hit anything. These particular knobs are in decent shape considering that. Only the one knob has a small chunk out of it, and the other is almost perfect.
The knobs come with the bar that attaches the two, and the screws that hold it in place.
All together, the set is 5 1/2" long, and the doorknobs have a diameter of 2 1/2".