The Relay Harness With Switch is designed specifically for high definition 40-50 inch light bars. With its large wire gauge and IP68 waterproof rating, this harness ensures reliable and durable performance. It fits most 40-50 inch light bars, making it a practical and versatile choice. Each harness is sold individually, providing convenience and ease of use. Upgrade your lighting setup with this reliable and efficient relay harness, perfect for enhancing visibility and safety in various applications.