3 1/4" Forged Brass Rosette With 21/32" Collar

When you have a pre-bored door, but want to use vintage style knobs, this 3 1/4" diameter rosette may be just the thing. The mounting screw holes are spaced at 2 1/2" on center, which places them outside the 2 1/8" bore. Made of solid, forged brass with a choice of finish.

Outside diameter: 3 1/4". Inside collar diameter: 21/32".

How do I know what door knobs will work with a particular rosette or door plate? The knob shank diameter should be a little less than the inside collar diameter on the rosette.