The 48.3 cm (19 inch) [377 x 302 mm] measurement is the size of the screen that our website sells screen protectors for. This size is commonly found in desktop monitors and some laptops. By providing screen protectors specifically designed for this size, we ensure that our customers can protect their screens from scratches, smudges, and other types of damage. Our range of screen protectors includes options such as tempered glass, anti-glare, and privacy filters, all of which are designed to fit perfectly on a 48.3 cm (19 inch) screen.