The Cipa Extreme is a 7″ x 20″ , 3 lens convex mirror, one stationary, two adjustable. Features a new ball and socket tension adjustment knob that will keep the mirror where the driver positions it. Cipa’s new universal quick-mount, anyi scratch windshield frame bracket (patented)will mount to rectangular or round top windshield frames from 3/8″ to 1 1/4″ thick – above or below the windshield. 120 square inch rear view