The Yakima Kayak Stacker is a car/truck rack designed specifically for transporting kayaks. Manufactured by Yakima, this model allows for secure stacking of multiple kayaks on the roof of a vehicle, making it ideal for trips to the water. With its durable construction and easy installation, the Yakima Kayak Stacker provides a convenient and safe solution for transporting kayaks to your next paddling adventure. These are new and still in the box. Never used. Works with round or square bars.