CIPA Premium Extreme Mirror is the first convex mirror with both a stationary lens and two adjustable lenses, allowing them to be set for viewing kids in the boat, the action on a slalom course, or a wakeboarder's air maneuvers. The ball-and-socket tension adjustment knob will keep this mirror exactly where it's positioned. A universal quick-mount, anti-scratch windshield frame bracket will mount above or below rectangular or round-top windshield frames from 3/4" to 1-1/4". Durable construction with one-year warranty. The 6" x 20" CIPA Extreme Mirror exceeds Alabama's 78 square-inch rear view mirror requirements with almost 120 square inches of rear coverage. Stationary lens is 12" x 6". Adjustment lenses are 4" x 6". 4" x 6" adjustment lenses Tension adjustment knob Quick-mount windshield frame bracket | Extreme Marine Mirror