The 30.7 cm (12.1 inch) [261 x 164 mm] is the size of the screen for a specific device that our website sells a range of screen protectors for. This measurement is important for customers to know so they can select the correct size screen protector for their device. By providing this information on our website, customers can ensure that they are purchasing a screen protector that will fit their device perfectly and provide the necessary protection against scratches, cracks, and other damage.