Measures 1.5M (5FT) long to span the width of most vehicles Aluminum Mounting Extrusion Channel, highlighted in red in photo. Very Sturdy These are sold in pairs with hardware to clamp onto existing roof rails (front to back). Allows for Awnings to be attached to factory roof cross bars Ideal to convert your original roof rails to a complete roof rack -- Dobinsons 4x4 offers these Universal Aluminum Mounting Channels to act as cross bars across your existing roof rack in order to facilitate the installation of a Dobinsons 4x4 Roof Top Tent (RTT) or a Dobinsons 4x4 Roll Out Awning. They could also be used to carry a kayak, bike rack, ski or snowboard cargo box, or for a luggage bag for family vacations. They are sold as pairs. Lightweight and durable, these could be used for a variety of purposes, and also for other brands of Roof Top Tents or Awnings. Many new vehicles come with factory-installed load bars (running front to back of a vehicle), but no cross bars. These are your solution to make better functional use of your roof. NOTE: They do not come with the awning L-brackets, those are supplied with the Dobinsons awnings. Note: Photo is for illustration purposes only.