This is an aluminum porthole window that weighs 26 pounds. The glass measures 15 3/4 x 21 3/4  inches. The outside edge of the frame measures 20 X 26 inches. The original glass has very minor wear that may include minor surface scratches, but no cracks or chips. The glass is clear, but could use a little more cleaning. These portholes have four working closure dogs that work freely. The flange on the back extends out from the frame by just under one inch.