C.R. LAURENCE GMP208G CRL Gray Double Blank With Screw Holes Glass Mirror Plate. Our Glass Mirror Switch and Outlet Cover Plates have highly polished 5/16" (8 mm) wide beveled edges, and are cut from quality 3/16" (5 mm) plate glass. There are a total of 45 different styles to choose from in single, double, triple, quad, five and six-gang, including a variety of blank plates. All come in three standard colors: Clear, bronze, and gray. Other colors are available on special order, and we can even cut plates out of the same colored mirror being used on your job. Custom cover plate configurations are also possible; just send us your drawing. All plates are individually blister carded in an attractive retail package. Mounting screws and plastic spacers included with each pack..