Model N1STDDWCMSNN2020. This fixed self-flashing aluminum frame skylight is designed for straightforward roof installation with built-in flashing for weather resistance. Outer dimensions are 18 inches wide x 18 inches long x 7.5 inches high, with a clear opening of 14.25 inches wide x 14.25 inches long. Features a durable aluminum frame and clear glazing. No damage or missing parts noted. Ideal for adding natural daylight to kitchens, hallways, or living spaces.