Youlumi dock light with swing arm is ETL listed for quality assurance and safe operation. Precision die-cast for outdoor use. Chip and fade-resistant powder coat finish. This dock light will be sure to light up even the longest trailer for efficient loading and unloading. The dock light arm features a durable 40 in steel arm to provide superior rigidity and prevent sagging. Arms are hinged for easy extension and compact folding when not in use.