Actual Privacy Screen Filter dimensions are 24 inch measured diagonally. 20.9 inch width x 11.8 inch high. Compare your screen dimensions against our dimension before purchasing. | Blocks visibility from side angles greater than 30 degrees from center, but NOT behind you. | Anti Scratch, Anti Blue Light, Anti Peeping and Easy Installation. | 2 installation options -- slide screen on and off or mount permanently. | Decrease surface reflection of lighting and external lighting.