The 54.1 cm (21.3 inch) [433 x 325 mm] is the screen size of a specific device that our website sells a range of screen protectors for. By providing this measurement, customers can ensure they are purchasing the correct size screen protector for their device, which will provide optimal protection against scratches, cracks, and other damage. Our website offers a variety of screen protectors, including tempered glass and film protectors, to cater to the diverse needs of our customers. With our high-quality screen protectors, customers can rest assured that their device's screen will remain in pristine condition for longer.