This large vintage brass porthole mirror has a total weight of 38 pounds. The outside frame measures 19 3/4 by 25 3/4 inches. The original glass measures 15 3/4 by 21 1/2 inches. The flange on the back extends out from the frame by about 3/4 inch. The total thickness of this porthole including the flange is 1 3/4 inches.