Naiture 8" x 12" Oversized Brass Wall Register Victorian Style Oil Rubbed Bronze Finish Duct opening size: 8" x 12" (9-7/8" x 13-1/4" Overall) Made of heavy-duty solid cast brass for durability. Finished with a durable oil rubbed bronze powder coat finish to resist rust. Removable louvers. Louver Control Extension from Register: 3/8" which could control air flow easily by foot. Includes 2" screws in matching finish. Longer mounting screws sold separately. Included the mounting hardware. To determine size needed, measure air duct opening rather than old register or grille.