Razo 270mm Convex Rear View Mirror RG21. Razo mirrors clip on to most stock rear view mirrors. Fits 2.25inch to 3.0inch tall mirrors. Stock rear view mirrors must have an overhead clearance of at least 1/5inch(5mm). Cannot be used on auto dimming mirror. Wider than OEM mirrors may interfere with occasional use of sun visors. Objects in convex mirror are closer than they appear.