Cast-Iron Decorative Victorian Rosette - 2" Diameter

Charming and decorative, our small Victorian Rosette (2-Inch Diameter) is a wonderful backdrop to our cast-iron and porcelain door knobs. The lively scroll pattern is reproduced in cast iron and comes in two vintage finishes options.

Dimensions: 2" D x 3/16" thick
Collar: 11/16" D
Projection: 3/8"
Fastener/s: M3 x 1/2" wood screws

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.