Circular Polarizer Lens Detachable for Apple iPhone 4 4S 4G 5 iPod Touch DC400 Circular Polarizer Conversion Lens for iPhone, iPad, mobile phones. Magnification: Circular Polarizer Easy install and instant on and off for quick changes. Dimensions (Main body): 20.6mm (diameter) x 19.9mm (length) Dimensions (Main body): 20.6mm (diameter) x 19.9mm (length)