Designed to work with most standard 50″ finned Curved Double Row LED light bars; For Straight LED light bar, see part number Z330050S. Eliminate annoying wind whistle caused by the airflow passing around the light bar with ZROADZ Noise Cancelling Wind Diffuser; The US Patented design provide an easy method to silence noisy roof mounted light bars;. Easy, one-piece installation, drilling required; Powdercoated gloss black finish;. Limited lifetime product warranty, 3 year warranty on the finish. ZROADZ Wind Diffusers are designed and manufactured in USA and protected by United States Patent No; 10,525,872;.