Kirkpatrick Fullbrook 7105 Standard Escutcheon Black Antique measures at 36mm in diameter. This is to be used with a 3 or 5 lever mortice deadlock or sashlock; some of these can be found in the related products or in the Locks & Latches category.
It has a black antique finish – this can be maintained by wiping over with a lightly oiled cloth from time to time.