2 1/2" Forged Brass Hexagonal Rosette With 21/32" Collar

This brass hexagonal rosette is a wonderful alternative to the round standards. Reproduced from an early 20th century original, it's made of solid, forged brass with a choice of finish.

Outside diameter: 2 1/2". Inside collar diameter: 21/32". Not for use on modern pre-bored doors.

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.