Truck-Lite (81260) Flood Lamp Features robust, cost effective, efficient design, Mounts on one 5/16'' -18 Stud Durable synthetic rubber housing resists corrosion, Includes mounting hardware Utilizes same 6 diode pattern as traditional Truck-Lite 4'' Round LED Lamps (STT, Backup, Dome, etc. Virtually impervious to shock & vibration, Designed to operate in extremely cold temperatures Epoxy encapsulated electronics protect lamp from damage caused by chemicals and moisture