The Fortessa Rounded Standard Escutcheon Satin Nickel has a 51mm 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 zinc alloy & has a satin nickel finish - it is to match the Achilles handle in the Fortessa range. Other Variations It is also available in a polished chrome finish & this can be found in the related products.