This little assembly will clean up blind spots in your rear and side view. We use custom convex glass formed to our own specification to give you the perfect balance between field of vision and image magnification. To reduce glare, the glass has an automotive quality mirror tinting. Rubber mounting helps the glass resist vibration.- 6061-T6 Aluminium CNC Machined Billet Construction - Black Anodized - All stainless hardware. - Fully modular assembly; all parts are replaceable. - Will fit most handlebar/clip-ons with an outer diameter of a 7/8? (requires10mm (3/8?) of bare bar out board of the grip/throttle assembly)