The Tudor Collection Square Standard Escutcheon Smooth Black Iron has a 45mm 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. Smooth Black Iron Escutcheon The smooth black iron finish does not have deep surface indentations like many other black finishes - this gives it a more modern feel. It is made from malleable cast iron, treated with a zinc phosphating process and then powder coated to provide a durable finish.