'PENNSY' O-SCALE SINGLE PORTAL - This system is a fully integrated system featuring the classic dressed block pattern of the Pennsylvania RR. Each component matches with each other to create a limitless combination of masonry construction. Outside dimensions: 9-1/4" W x 8-3/4" H x 1/2" thick. Inner arch dimensions are 5" wide by 6-1/2" high. VIRTUALLY EFFORTLESS! See also FL6150-Cut 'Pennsy' Stone Block Wall, FL6161-Single Track Cut Block Portal, FL6262-Double Track Cut Block Portal, FL6263-Extra-Wide Double Cut Block Portal, FL6191-Stone Retaining Wing Set, and FL6158-Stone Seam Sealers Set of 3. Click here to view more "Pennsy" style products!