The 7.1 cm (2.8 inch) [44 x 58.2 mm] measurement refers to the screen size of a specific device for which our website sells a range of screen protectors. It is important to know the exact size of the screen in order to choose the right screen protector that will fit perfectly and provide optimal protection. By providing this information, our customers can easily find the right screen protector for their device and ensure that their screen remains scratch-free and protected from damage.