The Blazer B278SAW 2-pack amber oblong stick-on reflectors are easy to install and ideal for any safety application. The reflectors can be used on trailers & trucks, school buses, agricultural equipment and more. Surface mount using the adhesive backing or on 3-15/16" centers with two screws (screws not included). Easy installation and stays in place in adverse weather conditions. Each reflector measures 4-3/8" W x 1-3/8" H.