Add an Attractive Name Directory to Your Apartment or Office - - Vikings vandal-resistant directories are an easily installed, high-quality line of displays, designed specifically to complement newly installed or existing secure-building entry systems. All models feature both weather and vandal resistant construction. - - The D-series directories are durably constructed from 18 gauge brushed stainless steel to perfectly match the style and function of Vikings stainless steel phones. - - Use with Vikings K-1900-3, C-3000 or C-4000 multi-tenant entry systems - Apartment buildings - Business directories - Schools and institutions - Public areas D10