Grand General's fleet LED lights offer an inexpensive way to upgrade your vehicle lighting. LEDs are brighter and have lower amp draw making it possible to add more lighting without upgrading your charging system. 4 inches round lights are a commonly used size in heavy and medium duty trucks. This red 4 inches round fleet LED is used for stop/turn/tail functions and uses a standard 3-prong pigtail. The fleet series is DOT (Department of Transportation) compliant for street legal lighting and is an excellent value choice.