Almost all the European architectural hardware standards follow a common format to help ease their understanding by users. Each product is classified under a number of performance headings and generally, these are the same for all products. All products are ”marked” with a six or more digit classification coding which show, in fine detail, just what levels of product performance are being claimed for this item. This classification system, when applied to all items of architectural hardware, will also enable complementary items to be specified to, for instance, a common level of corrosion resistance, category of use, door mass, etc.