The opening size for your artwork or puzzle, for this frame, is 16"x20". The 1.25" Wide Espresso Picture Frame is intended for use of framing jigsaw puzzles, art, posters, and various flat home decor. The frame comes with a sheet of clear plexi-glass that has protective film covers on both sides, that needs to be removed prior to installation. Hanging hardware is also included in the package for vertical or horizontal hanging. A sturdy backing is provided in the back of the frame.