The Truck-Lite 4.75" 12V Round 42-LED Strobe Light Lamp is the perfect choice for a variety of applications. This 12V lamp is designed to be durable and resistant to corrosion with its synthetic rubber housing. It also includes mounting hardware for easy installation and mounts on a 5/16" - 18 stud. The synchronized alternating feature makes this lamp ideal for emergency vehicles, construction vehicles, and other applications where visibility is a must. With its bright yellow light, this lamp will ensure that you are seen in any situation. FleetPride is your First Click in Heavy Duty®.