The Extreme Marine Mirror – 7 x 20 inch shatterproof multi-lens mirror is designed exclusively for ski boats. It provides an excellent wide view of the rear and sides of the boat. A ball and socket adjustment knob keep this mirror positioned exactly where you want it. The anti-scratch bracket mounts to rectangular or round windshield frames from 0.375" to 1.25". Quick and easy clamp-on design allows this mirror to be positioned to sit above or below the windshield frame. Constructed of heavy-duty material, this Extreme mirror withstands the durability test! The glass is made using a technique called First Surface Coating and meets OE standards. This ensures the highest quality and a crystal clear view!