Big Screen GPS Magnifier The RAM magnifier adaptor quickly installs between the RAM diamond mounting base and the device holder. The magnifying lens can be adjusted to a variety of angles to accommodate a wide variety of GPS units providing a more easily readable screen. Works with RAM holders that accept the RAM diamond base adaptor (RAM-B-238) The size is 2 inch x 4 inch and 2x magnification. Please note that this product will not work with the Garmin Zumo GPS Material: High Strength Composite and Clear Lens Colour: Black