The diameter of each knob is 2 1/4". Rosette diameter is 2".
Two pairs of turned wood doorknobs with brass rosettes. 3 of the knobs have a very similar reddish brown color to them and 1 of the knobs is lighter in color. Brass rosettes have a uniform finish. Two connecting spindles and all four set screws included. I do have additional knobs available, but no more matching rosettes. Additional pictures and measurements available upon request.