Multi-lens mirror - one stationary, two adjustable. Features a ball and socket adjustment knob that will keep the mirror where positioned. Bracket will mount to rectangular or round-top windshield frames. Exceeds Alabama's 78 square inch law with almost 120 square inches of clear rear vision.Size-20" W x 7" H, Fits-Windshields 3/8" to 1-1/4" thick