Developed through Truck-Lite experience in both LED Design and Heavy-Duty Warning Lighting Systems Design. Optics designed specifically for LED technology, not as a gaseous discharge retrofit. Additional color options excellent option for City/County Municipal, Cement Mixer, and other Heavy-Duty, Construction or Off-Road Applications. Dual and Quad Class I flash patterns meet legal functions. Rugged black powder coated corrosion-resistant die-cast aluminum base. Designed for Surface Mount as well as Pipe Mount (1NPT pipe thread).