The Delamain DK3 Standard Escutcheon Satin Chrome has a 55mm 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 Hinges, Locks & Latches category. This escutcheon is made from solid brass. It has a satin chrome finish which is to match the Delamain door knobs on rose.  It is also available in three different finishes: Florentine bronze Polished brass Polished chrome Some of these other variations can be found in the related products.