The Sliding Carriage Bolt Mounting Bar is a practical and versatile solution for securely mounting various types of lights on your vehicle's roof. Available in 46, 54, or 65 inches, this black coated aluminum bar features a sliding carriage bolt design for easy installation. It fits most Federal Signal warning lights, directional lights, work lights, mini-lightbars, and full-length lightbars. Please note that mounting hardware is not included and each bar is sold separately. With its durable construction and convenient design, this mounting bar ensures a hassle-free and reliable lighting setup for your vehicle.