Renaissance 20" x 4" Aluminum Cast Grille, outside dimensions are 6.125" x 22". Thickness is 1/4". Available three different ways: with a damper for air supply control; with a mesh screen; or plain with neither. Most heat registers will ship in 4-6 weeks but some sizes and finishes may take longer. Please call for availability and lead time on specific sizes and finishes. Available in three hand-applied finishes, click on image below to see finish options.