The rolling perforated door, another popular choice, are also available in an assortment of finishes and shapes thereby combining versatility and style. The steel security perforated grilles are available in standard aluminum grilles or can be fabricated to fit your needs. All steel security grilles are hot dip galvanized then powder coated. Upward-coiling perforated grille provides an attractive yet functional means to secure areas where public access must be restricted. Perforated gates are made of galvanized steel with tiny holes in the slats.