The Ludlow Foundries Octagonal Centre Door Knob Black Antique is 64mm in diameter and sits on a 63mm diameter base rose.  Attached by one single bolt through the door it is intended to be both decorative and functional.  In general a centre door knob will, as the name suggests, be placed in the centre of the door to aid closing, however they are often seen closer to the edge of the door. Malleable wrought iron is by its very nature susceptible to rusting and should be cared for accordingly, it will require a regular maintenance routine which should include a light applicat...