4-1/4" x 8" universal mirror, mounts above or below windshield frame. Fits up to 3/4&';&'; windshield frames. Fully adjustable mirror with anti-scratch quick-mount feature. - Large convex mirror for maximum boating safety- Universal - mounts above or below windshield, or to the dash- Anti-Scratch Quick Mount System TM fits up to 3/4 of an inch thick windshield frames- Non-corrosive materials salt spray tested