The 6.4 cm (2.5 inch) [50.59 x 38 mm] is a screen size specification for a particular device that our website sells screen protectors for. This measurement is important because it ensures that customers can find the right size screen protector to fit their device perfectly, providing optimal protection against scratches, cracks, and other damage. By offering a range of screen protectors specifically designed for this screen size, our website provides a convenient and reliable solution for customers looking to protect their device and extend its lifespan.