The 30.7 cm (12.1 inch) [261 x 164 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 easily identify if their device matches the size and dimensions of the screen protectors we offer. This information ensures that customers can purchase the correct screen protector for their device, which will provide optimal protection against scratches, cracks, and other damage.