The latest addition to our own door pull/knob collection.
For a high impact front door or interior door. 

Backplate 19.5cm Ø
Knob 11.5 cm Ø
total projection 12cm 

Several mounting methodes. We can discuss what would work best for your situ.

Shown in polished brass. Laquered to protect it from the elements. 
Other finishes available:
Aged brass.
Nickel plated or chrome plated.
Gold/brass  leaf, silver leaf, rose-gold leaf.
inish options depend on 'where the knob will be used'.

Last added image shows you the knob next to another large knob we have in our collection. That one has a backplate of 22cm Ø.