Note: 1.Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3.If the installation is uneven, or brick, paint, or cement wall, you can first drill holes on the border between the wall and the cover, and apply glass glue and screw screws at the same time, which is more stable. (To drill the side holes of the cover, use an electric drill! Not a percussion drill) (Note: The screw holes are not drilled in product, but the side holes are marked).