“ARBORIST ON SITE” Size: 12-3/4″w x 10-1/2″h Traffic cones, delineators, and barrels only alert people, they do not give directions. By using the Safety signs with your present cones and delineators, you now give fast and simple directions at a quick glance. This makes a safer work area and a more effective flow of traffic. These super strength durable plastic sign are easy to install without tools. Their firm grip locks on to any standard traffic cone or delineator.