Improve safety, Reduce liability. These directional reinforcement devices assist SAFER TRAFFIC CONTROL warning and directions in emergancy and work zones. Installs in seconds and hold firmly into place, easy snap-on sign fits like a paper clip. Reuseable and durable, available in Standard 12 3/4"W x 10 1/2"L. Large vertical 12"W x 13 1/4"L Also available REFLECTORIZED.