The Blazer B888R red oval aluminum reflector is easy to install and ideal for any safety application. This reflector can be used on trailers & trucks, school buses, agricultural equipment and more. The round reflector measures 3-3/16" and is set in an oval aluminum bracket measuring 4-1/2" W x 3-11/16" H. It surface mounts on 3-15/16" centers with two screws (screws not included).