This deluxe convex glass mirror from Overton's provides a wide, panoramic rear view with minimum distortion. Ideal for watching skiers and boat traffic. The new thumbscrew-mount makes installation easy, while the two-way bracket provides the option of mounting the mirror above or below the windshield. Stay-in-place tightener virtually eliminates a loose, wobbly mirror even in rough water. Fits windshields up to 1" thick.