The 43.4 cm (17.1 Inch) [378 x 212.8 mm] measurement is the screen size of a specific device that our website sells a range of screen protectors for. Knowing the exact screen size is crucial when selecting the right screen protector to ensure a perfect fit and maximum protection. Our website offers a variety of screen protectors for this device, including tempered glass, anti-glare, and privacy options, all designed to keep the screen safe from scratches, cracks, and other damage. By providing the exact screen size, customers can easily find the right screen protector for their device and ensure its longevity.