CIPA's Boating Safety Mirror is for water skiing and general boating safety. It features a fully adjustable anti-scratch, quick mount plastic bracket that fits square windshields up to 3/4 of an inch thick. The Boating Safety Mirror is designed to universally mount above or below the windshield frame, offering maximum rear view with a few simple adjustments. The ability to mount in the down position makes this mirror perfect for boats with walk-thru windshields. The mirror head on the Boating Safety Mirror measures 4.25 x 8 inches and features a convex acrylic safety lens for wide angle viewing and added safety. Each package includes two different anti-scratch mounting plates. One for standard thickness windshield frames (5/8 inch to 3/4 inch), and the other for frames thinner than 5/8 inches. Mirrors are made with non-corrosive materials and are salt spray tested.