Heavy Duty, Waterproof Red Combination Clearance ID Bar Marker 3 LED Trailer Boat RV Truck Holds three model S21 side markers (already installed), Ultra-efficient lens design leads the world in performance Exceeds FMVSS 108 standards when mounted properly, Reliable performance over 100,000 hours Waterproof, sealed body that is immune to shock and vibration, No exposed connections P2 rated side marker clearance lamp for Heavy duty trucks, Semi-trailers, Cargo trailers, Boat trailers Work vehicles and any motor vehicle requiring quality DOT rated lighting Made in the USA with a Lifetime Warranty!