The Concrete Class (SNiP 2.03.01-84*) mode enables to select a value for the characteristic strength of concrete and for the design strength of concrete at the ultimate limit state (the Ultimate Limit States tab) and the serviceability limit state (the Serviceability Limit States tab), depending on the compressive strength class of concrete according to SNiP 2.03.01-84*, as well as information on the minimum allowable concrete cover.