2"; Adjustable. Wide Angle Blind Spot Mirror With Mounting Tape. Significantly Reduces Blind Spots. As With All Convex Mirrors, Objects In Mirror Will Be Closer Than They Appear. Optimal Placement Is On The Bottom Outside Corner Of Driver Or Passenger Side Mirror, But Can Be Placed In Any Position For Blind Spot Reduction. It Is Highly Recommended To Test Positions Before Mounting With Adhesive. Adjustable After Placement For A More Customizable Wide Angle View. Sold As A Pair.