Abstract: An open frame has a shoulder which is inwardly on the outward surface of the frame and receives a flat rectangular panel with the edge portions of the panel against said shoulder. A continuous groove around the inner portion of said frame receives a bezel which protrudes into said groove and outwardly over the edge portions of the frame. The bezel is biased inwardly as to firmly hold the frame in place. The bezel can be removed by urging it toward the center of the frame.